1.  Branch Discovery     -> Identify branch and upstream
2.  Upstream Alignment   -> FIRST: Check rebase status (BLOCKING)
3.  CONTRIBUTING.md      -> Verify compliance (BLOCKING)
4.  Isolation Check      -> Single type, thematic files
5.  Scope Check          -> Verify changes match intended scope
6.  Quality Gate         -> Tests, linting (non-blocking)
7.  Report Generation    -> Summary with pass/fail

# Fetch latest upstream
git fetch origin main

# How many commits behind?
BEHIND=$(git rev-list --count HEAD..origin/main)
echo "Behind upstream: $BEHIND commits"

# Commit type analysis
git log --oneline main..HEAD | sed 's/^[^ ]* //' | grep -oE '^[a-z]+(\([^)]+\))?:' | sort -u

# File theme analysis
git diff --name-only main..HEAD | cut -d'/' -f1-2 | sort -u

# Infer scope from commit messages
SCOPE=$(git log --format="%s" main..HEAD | grep -oE '\([^)]+\)' | sort -u | head -1)

# All files should be within expected scope
git diff --name-only main..HEAD | grep -v "$SCOPE"

PR Validation: PASS

Branch: feature/suggest-validation (5 commits)
Upstream: main (in sync)

Checks:
  [OK] Isolation: Single type (refactor)
  [OK] Upstream: 0 commits behind
  [OK] Scope: 100% in internal/suggest/
  [OK] Quality: Tests pass

Ready for $pr-prep

PR Validation: BLOCKED

Checks:
  [FAIL] Isolation: Mixed types (refactor, fix, docs)
  [WARN] Upstream: 15 commits behind

Resolutions:
1. ISOLATION: Split branch by commit type
   git checkout main && git checkout -b refactor/suggest
   git cherry-pick <refactor-commits>

Run $pr-validate again after resolution.

# Cherry-pick to clean branch
git checkout main
git checkout -b ${BRANCH}-clean
git cherry-pick <relevant-commits-only>

# Rebase on latest upstream
git fetch origin main
git rebase origin/main