v1.92.0.0 ship-queue: merge trains for any repo (train gates, every prefix gated, direct/update land, train init/doctor) (GSTA-157 PR 2) (#3692)

* feat(ship): pause /ship on a red base instead of failing (gstack-base-red, conditional receipts) (GSTA-157 PR 1)

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

* fix: base-red shell runner launches bash through runBashSync

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

* test: base-red coverage additions (unreproduced head, unresolved head, readPause, wait unconfigured)

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

* docs: base-red pause in unattended endings; BASE_RED_UNCONFIGURED covers an invalid base policy

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* test: base-red coverage pass 2 (write --base-red, summary line, classify usage before fetch, unresolved-head detail)

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* feat(ship-queue): merge trains for any repo — train.gates (workflows/command), every prefix gated, generalized train land (direct/update, merge method), base-red trains, train init/doctor, watch --land (GSTA-157 PR 2)

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* fix: pre-landing review fixes (train gates: dispatch bound, lease, rebase, post-merge checks, output tail, caps)

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* fix: train land refuses the next slot until the previous slot's post-merge checks are green

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* docs: ship-policy, troubleshooting and captain for train gates review fixes

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* chore: changelog fragment for merge trains for any repo

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* test: keep ship-queue-train-generic out of the Windows subset (gh shim resolves gh.exe there)

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---------

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scripts/lib/windows-curation.ts

@@ -307,6 +307,10 @@ export const KNOWN_WINDOWS_INCOMPATIBLE: Array<{ file: string; reason: string }>
     file: 'test/ship-queue-train-ops.test.ts',
     reason: 'drives bin/gstack-ship-queue (screen verdicts, scratch-merge screens, prune --stale, watch, forget, verify --post-merge, ready --dispatch-ci, --stack-tests) against the same #!/bin/sh gh shim in test/helpers/ship-queue-train-fixture.ts',
   },
+  {
+    file: 'test/ship-queue-train-generic.test.ts',
+    reason: 'drives bin/gstack-ship-queue train build, verdict, land, watch, init and doctor against the same #!/bin/sh gh shim plus an extensionless node gh wrapper on a colon-joined PATH; on windows-latest spawnSync(\'gh\') resolves the runner\'s gh.exe instead (windows-free-shard 1, run 41218228855)',
+  },
   {
     file: 'test/ship-policy-compat.test.ts',
     reason: 'spawns bin/gstack-ship-policy, bin/gstack-restamp and bin/gstack-tree-receipt (shebangs) through test/helpers/restamp-fixture.ts',