chore: bump version and changelog (v0.11.16.0)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: garrytan

CHANGELOG.md

@@ -1,5 +1,20 @@
 # Changelog
 
+## [0.11.16.0] - 2026-03-24 — Smarter CI: 2-Tier E2E Test System
+
+### Changed
+
+- **CI runs only gate tests by default — periodic tests run weekly.** Every E2E test is now classified as `gate` (blocks PRs) or `periodic` (weekly cron + on-demand). Gate tests cover functional correctness and safety guardrails. Periodic tests cover expensive Opus quality benchmarks, non-deterministic routing tests, and tests requiring external services (Codex, Gemini). CI feedback is faster and cheaper while quality benchmarks still run weekly.
+- **Global touchfiles are now granular.** Previously, changing `gen-skill-docs.ts` triggered all 56 E2E tests. Now only the ~27 tests that actually depend on it run. Same for `llm-judge.ts`, `test-server.ts`, `worktree.ts`, and the Codex/Gemini session runners. The truly global list is down to 3 files (session-runner, eval-store, touchfiles.ts itself).
+- **New `test:gate` and `test:periodic` scripts** replace `test:e2e:fast`. Use `EVALS_TIER=gate` or `EVALS_TIER=periodic` to filter tests by tier.
+
+### For contributors
+
+- `E2E_TIERS` map in `test/helpers/touchfiles.ts` classifies every test — a free validation test ensures it stays in sync with `E2E_TOUCHFILES`
+- `EVALS_FAST` / `FAST_EXCLUDED_TESTS` removed in favor of `EVALS_TIER`
+- `allow_failure` removed from CI matrix (gate tests should be reliable)
+- New `.github/workflows/evals-periodic.yml` runs periodic tests Monday 6 AM UTC
+
 ## [0.11.15.0] - 2026-03-24 — E2E Test Coverage for Plan Reviews & Codex
 
 ### Added

VERSION

@@ -1 +1 @@
-0.11.15.0
+0.11.16.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "0.11.15.0",
+  "version": "0.11.16.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",