The PR-changed test planner fails safe to the compact full-suite plan for any diff touching packages/**, but that compact plan excludes all extension test configs, so mixed package+extension PRs landed with zero extension test execution (escapes: PR #120534 breaking extensions/codex run-attempt.native-hook-relay.test.ts, PRs #122163/#121522 and cd7b7f639d breaking media-understanding-provider.test.ts and thread-lifecycle.test.ts on main full runs). The preflight now appends whole-config shards for the diff's touched extensions whenever the precise plan fails safe; whole configs (not precise targets) because the fail-safe cause leaves the non-extension diff's extension impact unbounded.
* refactor: use canonical re-export names
* fix(test): classify suite support as test source
* fix(agents): retarget gateway stub session-entry import
* test(gateway): retarget session-utils mock keys after alias removal
Peter Steinberger