feat: switch to PR-based workflow

- Create feature branch (evolution/day-N)
- Create PR instead of direct push
- Auto-merge when CI passes
- Added pull-requests: write permission

Author: Patel230

.github/workflows/evolve.yml

@@ -8,6 +8,7 @@ on:
 permissions:
   contents: write
   issues: write
+  pull-requests: write
 
 jobs:
   evolve:

scripts/evolution/evolve.sh

@@ -176,13 +176,75 @@ log "Generating stats..."
 python3 scripts/build/generate_stats.py . 2>/dev/null || true
 git add docs/stats.json memory/weekly_summary.md 2>/dev/null || true
 
-# ── Final commit and push ──
-log "Pushing changes..."
+# ── Final commit and PR ──
+log "Creating pull request..."
+
+BRANCH="evolution/day-${DAY}"
+
+# Re-calculate day after pull (pull may overwrite DAY_COUNT)
+DAY=$(( ($(date -u +%s) - $(date -d "$BIRTH_DATE" +%s 2>/dev/null || date -j -f "%Y-%m-%d" "$BIRTH_DATE" +%s)) / 86400 ))
+echo "$DAY" > "${REPOPATH}/DAY_COUNT"
+
+# Stage and commit all changes
 if [[ -n $(git status -s) ]]; then
   git add -A
   git commit -m "iterate: Day $DAY evolution session" 2>/dev/null || true
 fi
+
+# Pull latest main
 git pull --rebase origin main 2>/dev/null || true
-git push origin main 2>/dev/null || log "Push failed"
+
+# Ensure DAY_COUNT is correct after pull
+echo "$DAY" > "${REPOPATH}/DAY_COUNT"
+git add DAY_COUNT 2>/dev/null || true
+git diff --cached --quiet || git commit --amend --no-edit 2>/dev/null || true
+
+# Check if there are changes to push
+if [[ -z $(git diff origin/main HEAD --stat 2>/dev/null) ]]; then
+  log "No changes to push — skipping PR"
+  git checkout main 2>/dev/null || true
+  log "=== evolution cycle completed ==="
+  exit 0
+fi
+
+# Create feature branch and push
+git checkout -b "$BRANCH" 2>/dev/null || git checkout "$BRANCH"
+git push -u origin "$BRANCH" --force-with-lease 2>/dev/null || {
+  log "Push failed, trying without lease"
+  git push -u origin "$BRANCH" 2>/dev/null || log "Push failed"
+}
+
+# Create PR
+PR_TITLE="iterate: Day $DAY evolution session"
+PR_BODY="## Evolution Session — Day $DAY
+
+Automated evolution session by iterate-evolve[bot].
+
+### What changed
+- Ran plan → implement → communicate pipeline
+- All changes verified with go build + go test
+
+### Journal
+See docs/JOURNAL.md for session details.
+
+---
+*Auto-generated by iterate*"
+
+gh pr create \
+  --repo "$GITHUB_REPO" \
+  --title "$PR_TITLE" \
+  --body "$PR_BODY" \
+  --base main \
+  --head "$BRANCH" 2>/dev/null || log "PR creation failed"
+
+# Auto-merge if PR was created
+PR_NUMBER=$(gh pr list --repo "$GITHUB_REPO" --head "$BRANCH" --json number --jq '.[0].number' 2>/dev/null)
+if [[ -n "$PR_NUMBER" && "$PR_NUMBER" != "null" ]]; then
+  log "Enabling auto-merge for PR #$PR_NUMBER"
+  gh pr merge "$PR_NUMBER" --repo "$GITHUB_REPO" --auto --squash 2>/dev/null || log "Auto-merge setup failed (may need branch protection)"
+fi
+
+# Switch back to main
+git checkout main 2>/dev/null || true
 
 log "=== evolution cycle completed ==="