Replace Flex/Bison with the Lime parser generator.

.github/.gitignore

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+# Node modules
+scripts/ai-review/node_modules/
+# Note: package-lock.json should be committed for reproducible CI/CD builds
+
+# Logs
+scripts/ai-review/cost-log-*.json
+scripts/ai-review/*.log
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Editor files
+*.swp
+*.swo
+*~
+.vscode/
+.idea/

.github/DEV_SETUP_FIX.md

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+# Dev Setup Commit Fix - Summary
+
+**Date:** 2026-03-10
+**Issue:** Sync workflow was failing because "dev setup" commits were detected as pristine master violations
+
+## Problem
+
+The sync workflow was rejecting the "dev setup v19" commit (e5aa2da496c) because it modifies files outside `.github/`. The original logic only allowed `.github/`-only commits, but didn't account for personal development environment commits.
+
+## Solution
+
+Updated sync workflows to recognize commits with messages starting with "dev setup" (case-insensitive) as allowed on master, in addition to `.github/`-only commits.
+
+## Changes Made
+
+### 1. Updated Sync Workflows
+
+**Files modified:**
+- `.github/workflows/sync-upstream.yml` (automatic hourly sync)
+- `.github/workflows/sync-upstream-manual.yml` (manual sync)
+
+**New logic:**
+```bash
+# Check for "dev setup" commits
+DEV_SETUP_COMMITS=$(git log --format=%s upstream/master..origin/master | grep -i "^dev setup" | wc -l)
+
+# Allow merge if:
+# - Only .github/ changes, OR
+# - Has "dev setup" commits
+if [ "$COMMITS_AHEAD" -gt 0 ] && [ "$NON_GITHUB_CHANGES" -gt 0 ]; then
+  if [ "$DEV_SETUP_COMMITS" -eq 0 ]; then
+    # FAIL: Code changes outside .github/ that aren't dev setup
+    exit 1
+  else
+    # OK: Dev setup commits are allowed
+    continue merge
+  fi
+fi
+```
+
+### 2. Created Policy Documentation
+
+**New file:** `.github/docs/pristine-master-policy.md`
+
+Documents the "mostly pristine" master policy:
+- ✅ `.github/` commits allowed (CI/CD configuration)
+- ✅ "dev setup ..." commits allowed (personal development environment)
+- ❌ Code changes not allowed (must use feature branches)
+
+## Current Commit Order
+
+```
+master:
+1. 9a2b895daa0 - Complete Phase 3: Windows builds + fix sync (newest)
+2. 1e6379300f8 - Add CI/CD automation: hourly sync, Bedrock AI review
+3. e5aa2da496c - dev setup v19
+4. 03facc1211b - upstream commits... (oldest)
+```
+
+**All three local commits will now be preserved during sync:**
+- Commit 1: Modifies `.github/` ✅
+- Commit 2: Modifies `.github/` ✅
+- Commit 3: Named "dev setup v19" ✅
+
+## Testing
+
+After committing these changes, the next hourly sync should:
+1. Detect 3 commits ahead of upstream (including the fix commit)
+2. Recognize that they're all allowed (`.github/` or "dev setup")
+3. Successfully merge upstream changes
+4. Create merge commit preserving all local commits
+
+**Verify manually:**
+```bash
+# Trigger manual sync
+# Actions → "Sync from Upstream (Manual)" → Run workflow
+
+# Check logs for:
+# "✓ Found 1 'dev setup' commit(s) - will merge"
+# "✓ Successfully merged upstream with local configuration"
+```
+
+## Future Updates
+
+When updating your development environment:
+
+```bash
+# Make changes
+git add .clangd flake.nix .vscode/ .idea/
+
+# IMPORTANT: Start commit message with "dev setup"
+git commit -m "dev setup v20: Update IDE and LSP configuration"
+
+git push origin master
+```
+
+The sync will recognize this and preserve it during merges.
+
+**Naming patterns recognized:**
+- `dev setup v20` ✅
+- `Dev setup: Update tools` ✅
+- `DEV SETUP - New config` ✅
+- `development environment changes` ❌ (doesn't start with "dev setup")
+
+## Benefits
+
+1. **No manual sync resolution needed** for dev environment updates
+2. **Simpler workflow** - dev setup stays on master where it's convenient
+3. **Clear policy** - documented what's allowed vs what requires feature branches
+4. **Automatic detection** - sync workflow handles it all automatically
+
+## What to Commit
+
+```bash
+git add .github/workflows/sync-upstream.yml
+git add .github/workflows/sync-upstream-manual.yml
+git add .github/docs/pristine-master-policy.md
+git add .github/DEV_SETUP_FIX.md
+
+git commit -m "Fix sync to allow 'dev setup' commits on master
+
+The sync workflow was failing because the 'dev setup v19' commit
+modifies files outside .github/. Updated workflows to recognize
+commits with messages starting with 'dev setup' as allowed on master.
+
+Changes:
+- Detect 'dev setup' commits by message pattern
+- Allow merge if commits are .github/ OR dev setup
+- Update merge messages to reflect preserved changes
+- Document pristine master policy
+
+This allows personal development environment commits (IDE configs,
+debugging tools, shell aliases, etc.) on master without violating
+the pristine mirror policy.
+
+See .github/docs/pristine-master-policy.md for details"
+
+git push origin master
+```
+
+## Next Sync Expected Behavior
+
+```
+Before:
+  Upstream: A---B---C---D (latest upstream)
+  Master:   A---B---C---X---Y---Z (X=CI/CD, Y=CI/CD, Z=dev setup)
+
+  Status: 3 commits ahead, 1 commit behind
+
+After:
+  Master:   A---B---C---X---Y---Z---M
+                        \         /
+                         D-------/
+
+  Where M = Merge commit preserving all local changes
+```
+
+All three local commits (CI/CD + dev setup) preserved! ✅
+
+---
+
+**Status:** Ready to commit and test
+**Documentation:** See `.github/docs/pristine-master-policy.md`