docs: point the documentation map at the Timing lane

The CI entry now names Lane=Timing and routes to release-gate.md, which carries
the evidence and the bar for adding a test to it. Memory (project_launcher_
direction) records the same, including the fix that regressed the other
platform, so the next session does not repeat the one-at-a-time chase.

docs/README.md

@@ -84,6 +84,8 @@ document in the same change; do not leave both claims standing.
   records. Completed plans remain historical.
 - [`ci-and-releases.md`](ci-and-releases.md) is the SSOT for the Gitea CI
   pipeline, the self-hosted runners, and how alpha releases are published.
+  Load-sensitive tests live in `Lane=Timing`; see
+  [`release-gate.md`](release-gate.md) before adding to it.
 - [`audit/`](audit/) contains completion and conformance audits.
 - [`reference/ace-commands.md`](reference/ace-commands.md) preserves the local
   ACE server's complete in-game command catalog and points to the authoritative