diff --git a/.github/workflows/README.md b/.github/workflows/README.md
new file mode 100644
index 00000000..1110c69d
--- /dev/null
+++ b/.github/workflows/README.md
@@ -0,0 +1,175 @@
+# GitHub Actions Workflows
+
+This directory contains the GitHub Actions workflows for the NOFX project.
+
+## 📚 Documentation Index
+
+- **[README.md](./README.md)** - This file, overview of all workflows
+- **[PERMISSIONS.md](./PERMISSIONS.md)** - Detailed permission analysis and security model
+- **[TRIGGERS.md](./TRIGGERS.md)** - Comparison of event triggers (pull_request vs pull_request_target vs workflow_run)
+- **[FORK_PR_FLOW.md](./FORK_PR_FLOW.md)** - Complete analysis of what happens when a fork PR is submitted
+- **[FLOW_DIAGRAM.md](./FLOW_DIAGRAM.md)** - Visual flow diagrams and quick reference
+
+## 🚀 Quick Start
+
+**Want to understand how fork PRs work?** → Read [FLOW_DIAGRAM.md](./FLOW_DIAGRAM.md)
+
+**Need security details?** → Read [PERMISSIONS.md](./PERMISSIONS.md)
+
+**Confused about triggers?** → Read [TRIGGERS.md](./TRIGGERS.md)
+
+## PR Check Workflows
+
+We use a **two-workflow pattern** to safely handle PR checks from both internal and fork PRs:
+
+### 1. `pr-checks-run.yml` - Execute Checks
+
+**Trigger:** On pull request (opened, synchronize, reopened)
+
+**Permissions:** Read-only
+
+**Purpose:** Executes all PR checks with read-only permissions, making it safe for fork PRs.
+
+**What it does:**
+- ✅ Checks PR title format (Conventional Commits)
+- ✅ Calculates PR size
+- ✅ Runs backend checks (Go formatting, vet, tests)
+- ✅ Runs frontend checks (linting, type checking, build)
+- ✅ Saves all results as artifacts
+
+**Security:** Safe for fork PRs because it only has read permissions and cannot access secrets or modify the repository.
+
+### 2. `pr-checks-comment.yml` - Post Results
+
+**Trigger:** When `pr-checks-run.yml` completes (workflow_run)
+
+**Permissions:** Write (pull-requests, issues)
+
+**Purpose:** Posts check results as PR comments, running in the main repository context.
+
+**What it does:**
+- ✅ Downloads artifacts from `pr-checks-run.yml`
+- ✅ Reads check results
+- ✅ Posts a comprehensive comment to the PR
+
+**Security:** Safe because:
+- Runs in the main repository context (not fork context)
+- Has write permissions but doesn't execute untrusted code
+- Only reads pre-generated results from artifacts
+
+### 3. `pr-checks.yml` - Strict Checks
+
+**Trigger:** On pull request
+
+**Permissions:** Read + conditional write
+
+**Purpose:** Runs mandatory checks that must pass before PR can be merged.
+
+**What it does:**
+- ✅ Validates PR title (blocks merge if invalid)
+- ✅ Auto-labels PR based on size and files changed (non-fork only)
+- ✅ Runs backend tests (Go)
+- ✅ Runs frontend tests (React/TypeScript)
+- ✅ Security scanning (Trivy, Gitleaks)
+
+**Security:**
+- Fork PRs: Only runs read-only operations (tests, security scans)
+- Non-fork PRs: Can add labels and comments
+- Uses `continue-on-error` for operations that may fail on forks
+
+## Why Two Workflows for PR Checks?
+
+### The Problem
+
+When a PR comes from a forked repository:
+- GitHub restricts `GITHUB_TOKEN` permissions for security
+- Fork PRs cannot write comments, add labels, or access secrets
+- This prevents malicious contributors from:
+  - Stealing repository secrets
+  - Modifying workflow files to execute malicious code
+  - Spamming issues/PRs with automated comments
+
+### The Solution
+
+**Two-Workflow Pattern:**
+
+```
+Fork PR Submitted
+       ↓
+[pr-checks-run.yml]
+  - Runs with read-only permissions
+  - Executes all checks safely
+  - Saves results to artifacts
+       ↓
+[pr-checks-comment.yml]
+  - Triggered by workflow_run
+  - Runs in main repo context (has write permissions)
+  - Downloads artifacts
+  - Posts comment with results
+```
+
+This approach:
+- ✅ Allows fork PRs to run checks
+- ✅ Safely posts results as comments
+- ✅ Prevents security vulnerabilities
+- ✅ Follows GitHub's best practices
+
+### Can workflow_run Comment on Fork PRs?
+
+**Yes! ✅ The permissions are sufficient.**
+
+**Key Understanding:**
+- `workflow_run` executes in the **base repository** context
+- Fork PRs exist in the **base repository** (not in the fork)
+- The base repository's `GITHUB_TOKEN` has write permissions
+- Therefore, `workflow_run` can comment on fork PRs
+
+**Security:**
+- Fork PR code runs in isolated environment (read-only)
+- Comment workflow doesn't execute fork code
+- Only reads pre-generated artifact data
+
+**For detailed permission analysis, see:** [PERMISSIONS.md](./PERMISSIONS.md)
+
+## Workflow Comparison
+
+| Workflow | Fork PRs | Write Access | Blocks Merge | Purpose |
+|----------|----------|--------------|--------------|---------|
+| `pr-checks-run.yml` | ✅ Yes | ❌ No | ❌ No | Advisory checks |
+| `pr-checks-comment.yml` | ✅ Yes | ✅ Yes* | ❌ No | Post results |
+| `pr-checks.yml` | ✅ Yes | ⚠️ Partial | ✅ Yes | Mandatory checks |
+
+\* Write access only in main repo context, not available to fork PR code
+
+## File History
+
+- `pr-checks-advisory.yml.old` - Old advisory workflow that failed on fork PRs (deprecated)
+- Now replaced by the two-workflow pattern (`pr-checks-run.yml` + `pr-checks-comment.yml`)
+
+## Testing the Workflows
+
+### Test with a Fork PR
+
+1. Fork the repository
+2. Make changes in your fork
+3. Create a PR to the main repository
+4. Observe:
+   - `pr-checks-run.yml` runs successfully with read-only access
+   - `pr-checks-comment.yml` posts results as a comment
+   - `pr-checks.yml` runs tests but skips labeling
+
+### Test with a Branch PR
+
+1. Create a branch in the main repository
+2. Make changes
+3. Create a PR
+4. Observe:
+   - All workflows run with full permissions
+   - Labels are added automatically
+   - Comments are posted
+
+## References
+
+- [GitHub Actions: Keeping your GitHub Actions and workflows secure Part 1](https://securitylab.github.com/research/github-actions-preventing-pwn-requests/)
+- [Safely posting comments from untrusted workflows](https://securitylab.github.com/research/github-actions-building-blocks/)
+- [GitHub Actions: workflow_run trigger](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_run)
diff --git a/.github/workflows/pr-checks-advisory.yml b/.github/workflows/pr-checks-advisory.yml.old
similarity index 100%
rename from .github/workflows/pr-checks-advisory.yml
rename to .github/workflows/pr-checks-advisory.yml.old
diff --git a/.github/workflows/pr-checks-comment.yml b/.github/workflows/pr-checks-comment.yml
new file mode 100644
index 00000000..f0806026
--- /dev/null
+++ b/.github/workflows/pr-checks-comment.yml
@@ -0,0 +1,239 @@
+name: PR Checks - Comment
+
+# This workflow posts PR check results as comments
+# Runs in the main repo context with write permissions (SAFE)
+# Triggered after pr-checks-run.yml completes
+
+on:
+  workflow_run:
+    workflows: ["PR Checks - Run"]
+    types: [completed]
+
+# Write permissions - SAFE because runs in main repo context
+# This token has write access to the base repository
+# Fork PRs exist in the base repo, so we can comment on them
+permissions:
+  pull-requests: write
+  issues: write
+  actions: read  # Needed to download artifacts
+
+jobs:
+  comment:
+    name: Post Check Results
+    runs-on: ubuntu-latest
+    # Only run if the workflow was triggered by a pull_request event
+    if: github.event.workflow_run.event == 'pull_request'
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+          path: artifacts
+
+      - name: List downloaded artifacts
+        run: |
+          echo "=== Checking downloaded artifacts ==="
+          ls -la artifacts/ || echo "No artifacts directory"
+          find artifacts/ -type f || echo "No files found"
+
+      - name: Read PR info results
+        id: pr-info
+        continue-on-error: true
+        run: |
+          if [ -f artifacts/pr-info-results/pr-info.json ]; then
+            echo "=== PR Info JSON ==="
+            cat artifacts/pr-info-results/pr-info.json
+            echo "pr_number=$(jq -r '.pr_number' artifacts/pr-info-results/pr-info.json)" >> $GITHUB_OUTPUT
+            echo "title_status=$(jq -r '.title_status' artifacts/pr-info-results/pr-info.json)" >> $GITHUB_OUTPUT
+            echo "title_message=$(jq -r '.title_message' artifacts/pr-info-results/pr-info.json)" >> $GITHUB_OUTPUT
+            echo "size=$(jq -r '.size' artifacts/pr-info-results/pr-info.json)" >> $GITHUB_OUTPUT
+            echo "lines=$(jq -r '.lines' artifacts/pr-info-results/pr-info.json)" >> $GITHUB_OUTPUT
+            echo "size_suggestion=$(jq -r '.size_suggestion' artifacts/pr-info-results/pr-info.json)" >> $GITHUB_OUTPUT
+          else
+            echo "pr_number=0" >> $GITHUB_OUTPUT
+            echo "⚠️ PR info artifact not found"
+          fi
+
+      - name: Read backend results
+        id: backend
+        continue-on-error: true
+        run: |
+          if [ -f artifacts/backend-results/backend-results.json ]; then
+            echo "=== Backend Results JSON ==="
+            cat artifacts/backend-results/backend-results.json
+            echo "fmt_status=$(jq -r '.fmt_status' artifacts/backend-results/backend-results.json)" >> $GITHUB_OUTPUT
+            echo "vet_status=$(jq -r '.vet_status' artifacts/backend-results/backend-results.json)" >> $GITHUB_OUTPUT
+            echo "test_status=$(jq -r '.test_status' artifacts/backend-results/backend-results.json)" >> $GITHUB_OUTPUT
+
+            # Read output files
+            if [ -f artifacts/backend-results/fmt-files.txt ]; then
+              echo "fmt_files<<EOF" >> $GITHUB_OUTPUT
+              cat artifacts/backend-results/fmt-files.txt >> $GITHUB_OUTPUT
+              echo "EOF" >> $GITHUB_OUTPUT
+            fi
+            if [ -f artifacts/backend-results/vet-output-short.txt ]; then
+              echo "vet_output<<EOF" >> $GITHUB_OUTPUT
+              cat artifacts/backend-results/vet-output-short.txt >> $GITHUB_OUTPUT
+              echo "EOF" >> $GITHUB_OUTPUT
+            fi
+            if [ -f artifacts/backend-results/test-output-short.txt ]; then
+              echo "test_output<<EOF" >> $GITHUB_OUTPUT
+              cat artifacts/backend-results/test-output-short.txt >> $GITHUB_OUTPUT
+              echo "EOF" >> $GITHUB_OUTPUT
+            fi
+          else
+            echo "⚠️ Backend results artifact not found"
+          fi
+
+      - name: Read frontend results
+        id: frontend
+        continue-on-error: true
+        run: |
+          if [ -f artifacts/frontend-results/frontend-results.json ]; then
+            echo "=== Frontend Results JSON ==="
+            cat artifacts/frontend-results/frontend-results.json
+            echo "lint_status=$(jq -r '.lint_status' artifacts/frontend-results/frontend-results.json)" >> $GITHUB_OUTPUT
+            echo "typecheck_status=$(jq -r '.typecheck_status' artifacts/frontend-results/frontend-results.json)" >> $GITHUB_OUTPUT
+            echo "build_status=$(jq -r '.build_status' artifacts/frontend-results/frontend-results.json)" >> $GITHUB_OUTPUT
+
+            # Read output files
+            if [ -f artifacts/frontend-results/lint-output-short.txt ]; then
+              echo "lint_output<<EOF" >> $GITHUB_OUTPUT
+              cat artifacts/frontend-results/lint-output-short.txt >> $GITHUB_OUTPUT
+              echo "EOF" >> $GITHUB_OUTPUT
+            fi
+            if [ -f artifacts/frontend-results/typecheck-output-short.txt ]; then
+              echo "typecheck_output<<EOF" >> $GITHUB_OUTPUT
+              cat artifacts/frontend-results/typecheck-output-short.txt >> $GITHUB_OUTPUT
+              echo "EOF" >> $GITHUB_OUTPUT
+            fi
+            if [ -f artifacts/frontend-results/build-output-short.txt ]; then
+              echo "build_output<<EOF" >> $GITHUB_OUTPUT
+              cat artifacts/frontend-results/build-output-short.txt >> $GITHUB_OUTPUT
+              echo "EOF" >> $GITHUB_OUTPUT
+            fi
+          else
+            echo "⚠️ Frontend results artifact not found"
+          fi
+
+      - name: Post combined comment
+        if: steps.pr-info.outputs.pr_number != '0'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const prNumber = ${{ steps.pr-info.outputs.pr_number }};
+
+            // PR Info section
+            const titleStatus = '${{ steps.pr-info.outputs.title_status }}' || '⚠️ Unknown';
+            const prSize = '${{ steps.pr-info.outputs.size }}' || '⚠️ Unknown';
+            const prLines = '${{ steps.pr-info.outputs.lines }}' || '0';
+            const sizeSuggestion = '${{ steps.pr-info.outputs.size_suggestion }}' || '';
+
+            let comment = '## 🤖 PR Checks Results\n\n';
+            comment += 'Thank you for your contribution! Here are the automated check results:\n\n';
+
+            // PR Info
+            comment += '### 📋 PR Information\n\n';
+            comment += '**Title Format:** ' + titleStatus + '\n';
+            comment += '**PR Size:** ' + prSize + ' (' + prLines + ' lines changed)\n';
+            if (sizeSuggestion) {
+              comment += '\n💡 **Suggestion:** ' + sizeSuggestion + '\n';
+            }
+
+            // Backend checks
+            const fmtStatus = '${{ steps.backend.outputs.fmt_status }}';
+            const vetStatus = '${{ steps.backend.outputs.vet_status }}';
+            const testStatus = '${{ steps.backend.outputs.test_status }}';
+
+            if (fmtStatus || vetStatus || testStatus) {
+              comment += '\n### 🔧 Backend Checks\n\n';
+
+              if (fmtStatus) {
+                comment += '**Go Formatting:** ' + fmtStatus + '\n';
+                const fmtFiles = `${{ steps.backend.outputs.fmt_files }}`;
+                if (fmtFiles && fmtFiles.trim()) {
+                  comment += '<details><summary>Files needing formatting</summary>\n\n```\n' + fmtFiles + '\n```\n</details>\n\n';
+                }
+              }
+
+              if (vetStatus) {
+                comment += '**Go Vet:** ' + vetStatus + '\n';
+                const vetOutput = `${{ steps.backend.outputs.vet_output }}`;
+                if (vetOutput && vetOutput.trim()) {
+                  comment += '<details><summary>Issues found</summary>\n\n```\n' + vetOutput.substring(0, 1000) + '\n```\n</details>\n\n';
+                }
+              }
+
+              if (testStatus) {
+                comment += '**Tests:** ' + testStatus + '\n';
+                const testOutput = `${{ steps.backend.outputs.test_output }}`;
+                if (testOutput && testOutput.trim()) {
+                  comment += '<details><summary>Test output</summary>\n\n```\n' + testOutput.substring(0, 1000) + '\n```\n</details>\n\n';
+                }
+              }
+
+              comment += '\n**Fix locally:**\n';
+              comment += '```bash\n';
+              comment += 'go fmt ./...      # Format code\n';
+              comment += 'go vet ./...      # Check for issues\n';
+              comment += 'go test ./...     # Run tests\n';
+              comment += '```\n';
+            }
+
+            // Frontend checks
+            const lintStatus = '${{ steps.frontend.outputs.lint_status }}';
+            const typecheckStatus = '${{ steps.frontend.outputs.typecheck_status }}';
+            const buildStatus = '${{ steps.frontend.outputs.build_status }}';
+
+            if (lintStatus || typecheckStatus || buildStatus) {
+              comment += '\n### ⚛️ Frontend Checks\n\n';
+
+              if (lintStatus) {
+                comment += '**Linting:** ' + lintStatus + '\n';
+                const lintOutput = `${{ steps.frontend.outputs.lint_output }}`;
+                if (lintOutput && lintOutput.trim()) {
+                  comment += '<details><summary>Issues found</summary>\n\n```\n' + lintOutput.substring(0, 500) + '\n```\n</details>\n\n';
+                }
+              }
+
+              if (typecheckStatus) {
+                comment += '**Type Checking:** ' + typecheckStatus + '\n';
+                const typecheckOutput = `${{ steps.frontend.outputs.typecheck_output }}`;
+                if (typecheckOutput && typecheckOutput.trim()) {
+                  comment += '<details><summary>Type errors</summary>\n\n```\n' + typecheckOutput.substring(0, 500) + '\n```\n</details>\n\n';
+                }
+              }
+
+              if (buildStatus) {
+                comment += '**Build:** ' + buildStatus + '\n';
+                const buildOutput = `${{ steps.frontend.outputs.build_output }}`;
+                if (buildOutput && buildOutput.trim()) {
+                  comment += '<details><summary>Build output</summary>\n\n```\n' + buildOutput.substring(0, 500) + '\n```\n</details>\n\n';
+                }
+              }
+
+              comment += '\n**Fix locally:**\n';
+              comment += '```bash\n';
+              comment += 'cd web\n';
+              comment += 'npm run lint -- --fix  # Fix linting\n';
+              comment += 'npm run type-check     # Check types\n';
+              comment += 'npm run build          # Test build\n';
+              comment += '```\n';
+            }
+
+            comment += '\n---\n\n';
+            comment += '### 📖 Resources\n\n';
+            comment += '- [Contributing Guidelines](https://github.com/tinkle-community/nofx/blob/dev/CONTRIBUTING.md)\n';
+            comment += '- [Migration Guide](https://github.com/tinkle-community/nofx/blob/dev/docs/community/MIGRATION_ANNOUNCEMENT.md)\n\n';
+            comment += '**Questions?** Feel free to ask in the comments! 🙏\n\n';
+            comment += '---\n\n';
+            comment += '*These checks are advisory and won\'t block your PR from being merged. This comment is automatically generated from [pr-checks-run.yml](https://github.com/tinkle-community/nofx/blob/dev/.github/workflows/pr-checks-run.yml).*';
+
+            // Post comment
+            await github.rest.issues.createComment({
+              issue_number: prNumber,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: comment
+            });
diff --git a/.github/workflows/pr-checks-run.yml b/.github/workflows/pr-checks-run.yml
new file mode 100644
index 00000000..eacee17b
--- /dev/null
+++ b/.github/workflows/pr-checks-run.yml
@@ -0,0 +1,238 @@
+name: PR Checks - Run
+
+# This workflow runs all PR checks with read-only permissions
+# Safe for fork PRs - results are saved as artifacts
+# Companion workflow (pr-checks-comment.yml) will post comments
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches: [main, dev]
+
+# Read-only permissions - safe for fork PRs
+permissions:
+  contents: read
+
+jobs:
+  pr-info:
+    name: PR Information
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check PR title format
+        id: check-title
+        run: |
+          PR_TITLE="${{ github.event.pull_request.title }}"
+
+          # Check if title follows conventional commits
+          if echo "$PR_TITLE" | grep -qE "^(feat|fix|docs|style|refactor|perf|test|chore|ci|security)(\(.+\))?: .+"; then
+            echo "status=✅ Good" >> $GITHUB_OUTPUT
+            echo "message=PR title follows Conventional Commits format" >> $GITHUB_OUTPUT
+          else
+            echo "status=⚠️ Suggestion" >> $GITHUB_OUTPUT
+            echo "message=Consider using Conventional Commits format: type(scope): description" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Calculate PR size and save results
+        id: pr-size
+        run: |
+          ADDITIONS=${{ github.event.pull_request.additions }}
+          DELETIONS=${{ github.event.pull_request.deletions }}
+          TOTAL=$((ADDITIONS + DELETIONS))
+
+          if [ $TOTAL -lt 100 ]; then
+            SIZE="🟢 Small"
+            SUGGESTION=""
+          elif [ $TOTAL -lt 500 ]; then
+            SIZE="🟡 Medium"
+            SUGGESTION=""
+          else
+            SIZE="🔴 Large"
+            SUGGESTION="Consider breaking this into smaller PRs for easier review"
+          fi
+
+          # Save all results to JSON file
+          cat > pr-info.json <<EOF
+          {
+            "pr_number": ${{ github.event.pull_request.number }},
+            "title_status": "${{ steps.check-title.outputs.status }}",
+            "title_message": "${{ steps.check-title.outputs.message }}",
+            "size": "$SIZE",
+            "lines": $TOTAL,
+            "size_suggestion": "$SUGGESTION"
+          }
+          EOF
+
+          cat pr-info.json
+
+      - name: Upload PR info results
+        uses: actions/upload-artifact@v4
+        with:
+          name: pr-info-results
+          path: pr-info.json
+          retention-days: 1
+
+  backend-checks:
+    name: Backend Checks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.21'
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libta-lib-dev || true
+          go mod download || true
+
+      - name: Check Go formatting
+        id: go-fmt
+        continue-on-error: true
+        run: |
+          UNFORMATTED=$(gofmt -l . 2>/dev/null || echo "")
+          if [ -n "$UNFORMATTED" ]; then
+            echo "status=⚠️ Needs formatting" >> $GITHUB_OUTPUT
+            echo "$UNFORMATTED" | head -10 > fmt-files.txt
+          else
+            echo "status=✅ Good" >> $GITHUB_OUTPUT
+            echo "" > fmt-files.txt
+          fi
+
+      - name: Run go vet
+        id: go-vet
+        continue-on-error: true
+        run: |
+          if go vet ./... 2>&1 | tee vet-output.txt; then
+            echo "status=✅ Good" >> $GITHUB_OUTPUT
+          else
+            echo "status=⚠️ Issues found" >> $GITHUB_OUTPUT
+            cat vet-output.txt | head -20 > vet-output-short.txt
+          fi
+
+      - name: Run tests
+        id: go-test
+        continue-on-error: true
+        run: |
+          if go test ./... -v 2>&1 | tee test-output.txt; then
+            echo "status=✅ Passed" >> $GITHUB_OUTPUT
+          else
+            echo "status=⚠️ Failed" >> $GITHUB_OUTPUT
+            cat test-output.txt | tail -30 > test-output-short.txt
+          fi
+
+      - name: Save backend results
+        if: always()
+        run: |
+          cat > backend-results.json <<EOF
+          {
+            "pr_number": ${{ github.event.pull_request.number }},
+            "fmt_status": "${{ steps.go-fmt.outputs.status }}",
+            "vet_status": "${{ steps.go-vet.outputs.status }}",
+            "test_status": "${{ steps.go-test.outputs.status }}"
+          }
+          EOF
+
+      - name: Upload backend results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: backend-results
+          path: |
+            backend-results.json
+            fmt-files.txt
+            vet-output-short.txt
+            test-output-short.txt
+          retention-days: 1
+
+  frontend-checks:
+    name: Frontend Checks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+
+      - name: Check if web directory exists
+        id: check-web
+        run: |
+          if [ -d "web" ]; then
+            echo "exists=true" >> $GITHUB_OUTPUT
+          else
+            echo "exists=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Install dependencies
+        if: steps.check-web.outputs.exists == 'true'
+        working-directory: ./web
+        continue-on-error: true
+        run: npm ci
+
+      - name: Run linter
+        if: steps.check-web.outputs.exists == 'true'
+        id: lint
+        working-directory: ./web
+        continue-on-error: true
+        run: |
+          if npm run lint 2>&1 | tee lint-output.txt; then
+            echo "status=✅ Good" >> $GITHUB_OUTPUT
+          else
+            echo "status=⚠️ Issues found" >> $GITHUB_OUTPUT
+            cat lint-output.txt | head -20 > lint-output-short.txt
+          fi
+
+      - name: Type check
+        if: steps.check-web.outputs.exists == 'true'
+        id: typecheck
+        working-directory: ./web
+        continue-on-error: true
+        run: |
+          if npm run type-check 2>&1 | tee typecheck-output.txt; then
+            echo "status=✅ Good" >> $GITHUB_OUTPUT
+          else
+            echo "status=⚠️ Issues found" >> $GITHUB_OUTPUT
+            cat typecheck-output.txt | head -20 > typecheck-output-short.txt
+          fi
+
+      - name: Build
+        if: steps.check-web.outputs.exists == 'true'
+        id: build
+        working-directory: ./web
+        continue-on-error: true
+        run: |
+          if npm run build 2>&1 | tee build-output.txt; then
+            echo "status=✅ Success" >> $GITHUB_OUTPUT
+          else
+            echo "status=⚠️ Failed" >> $GITHUB_OUTPUT
+            cat build-output.txt | tail -20 > build-output-short.txt
+          fi
+
+      - name: Save frontend results
+        if: always() && steps.check-web.outputs.exists == 'true'
+        working-directory: ./web
+        run: |
+          cat > frontend-results.json <<EOF
+          {
+            "pr_number": ${{ github.event.pull_request.number }},
+            "lint_status": "${{ steps.lint.outputs.status }}",
+            "typecheck_status": "${{ steps.typecheck.outputs.status }}",
+            "build_status": "${{ steps.build.outputs.status }}"
+          }
+          EOF
+
+      - name: Upload frontend results
+        if: always() && steps.check-web.outputs.exists == 'true'
+        uses: actions/upload-artifact@v4
+        with:
+          name: frontend-results
+          path: |
+            web/frontend-results.json
+            web/lint-output-short.txt
+            web/typecheck-output-short.txt
+            web/build-output-short.txt
+          retention-days: 1
diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
index 85d89942..3e285920 100644
--- a/.github/workflows/pr-checks.yml
+++ b/.github/workflows/pr-checks.yml
@@ -7,11 +7,13 @@ on:
       - dev
       - main
 
-# Default permissions for all jobs (can be overridden per job)
+# Default permissions for all jobs
+# Note: Fork PRs won't have write access for security
+# Advisory checks use separate workflow (pr-checks-run.yml + pr-checks-comment.yml)
 permissions:
   contents: read           # Read repository contents
-  pull-requests: write     # Manage PRs (labels, comments)
-  issues: write           # Manage issues (PRs are issues)
+  pull-requests: write     # Manage PRs (labels, comments) - only works for non-fork PRs
+  issues: write           # Manage issues (PRs are issues) - only works for non-fork PRs
 
 jobs:
   # Validate PR title and description
@@ -50,6 +52,7 @@ jobs:
 
       - name: Check PR size
         uses: actions/github-script@v7
+        continue-on-error: true  # Don't fail for fork PRs
         with:
           script: |
             const pr = context.payload.pull_request;
@@ -57,6 +60,9 @@ jobs:
             const deletions = pr.deletions;
             const total = additions + deletions;
 
+            // Check if this is a fork PR
+            const isFork = pr.head.repo.full_name !== pr.base.repo.full_name;
+
             let label = '';
             let comment = '';
 
@@ -71,22 +77,31 @@ jobs:
               comment = '🚨 This PR is **large** (>' + total + ' lines changed). Please consider breaking it into smaller, focused PRs for easier review.';
             }
 
-            // Add size label
-            await github.rest.issues.addLabels({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: pr.number,
-              labels: [label]
-            });
+            // Only add labels/comments for non-fork PRs (fork PRs don't have write permission)
+            if (!isFork) {
+              try {
+                // Add size label
+                await github.rest.issues.addLabels({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: pr.number,
+                  labels: [label]
+                });
 
-            // Add comment for large PRs
-            if (total >= 1000) {
-              await github.rest.issues.createComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: pr.number,
-                body: comment
-              });
+                // Add comment for large PRs
+                if (total >= 1000) {
+                  await github.rest.issues.createComment({
+                    owner: context.repo.owner,
+                    repo: context.repo.repo,
+                    issue_number: pr.number,
+                    body: comment
+                  });
+                }
+              } catch (error) {
+                console.log('Failed to add label/comment (expected for fork PRs):', error.message);
+              }
+            } else {
+              console.log('Fork PR detected - skipping label/comment (will be handled by pr-checks-comment.yml)');
             }
 
   # Backend tests
@@ -186,6 +201,8 @@ jobs:
   auto-label:
     name: Auto Label PR
     runs-on: ubuntu-latest
+    # Only run for non-fork PRs (fork PRs don't have write permission)
+    if: github.event.pull_request.head.repo.full_name == github.repository
     permissions:
       contents: read
       pull-requests: write