v1.95.0.0 feat(ship-queue): land --pin merges a READY PR at its own green head (merge: direct, GSTA-258 L2 PR 1) (#3973)

* feat(ship-queue): land --pin merges a READY PR at its own green head under merge: direct (GSTA-258 L2 PR 1)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(ship-policy): keep gstack's policy on train until the merge key's release exists; regenerate doctor components; floor test

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(ship-queue): direct land fails closed without a merge base; stamping land refuses under merge: direct; Windows curation for the gh shim test

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(ship-queue): land --pin reads policy after fetching the base, fetches the pin before verifying, and tells cannot-verify apart from a mismatch

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* docs(ship-policy): land --pin STAMPED row names .gstack/version-path

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* test(ship-queue): the merge-key floor test simulates its restamp on a tentative constant, so it holds after the stamp

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

---------

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

scripts/lib/windows-curation.ts

@@ -51,6 +51,7 @@ const WINDOWS_FRAGILE_PATTERNS: Array<{ pattern: RegExp; reason: string }> = [
 // when possible; this list is for environment-/runtime-specific tests where
 // the failure mode is structural rather than detectable via source-file scan.
 export const KNOWN_WINDOWS_INCOMPATIBLE: Array<{ file: string; reason: string }> = [
+  { file: 'test/ship-queue-land-direct.test.ts', reason: 'the same extensionless node gh shim as test/ship-queue-land.test.ts; windows-latest launches the runner\'s gh.exe instead (no GH_TOKEN), so every land case fails (windows-scoped-shard, run 41720760327); land is a controller command run on Linux and macOS' },
   { file: 'test/ship-queue-land.test.ts', reason: 'its gh shim is an extensionless #!/usr/bin/env node script on a colon-joined PATH, which windows-latest cannot launch, so land reaches the real gh (no GH_TOKEN) and every case fails (windows-free-shard 6, run 40824965988); land is a controller command run on Linux and macOS' },
   // Like test/paid-rerun.test.ts (excluded by pattern), it replays a gate capture through the paid lane's --report and --rerun-plan CLI.
   { file: 'test/shared-libs-index-flags-readonly.test.ts', reason: 'its assume-unchanged replay seeds the review through test/helpers/shared-libs-path-fixture.ts, which launches bin/gstack-review-log (a bash script) directly; windows-latest refuses it as not found in $PATH (windows-free-shard 5, run 40727825859)' },