Let a repo keep its tier-only test folders out of /ship's local test run (GST-2500) (#4305)

* Let a declared test folder skip /ship's local test run

A [] declaration on a glob naming a test directory now leaves the selected
tests under it unrun in pregate's local lane, with one recorded line per glob.

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

* Fix the declared test tree test's type

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

* Only skip tests for a [] on a folder inside a test directory, and only in the local lane

A [] on the whole test directory (test/**) is a common way to clear helpers and
must keep running mapped tests. The skip now applies to the local lane only, after
always-run tests join, so remote obligations and always-run tripwires are unchanged.

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

* Keep a [] on a single test file from skipping that test

Review-Finding: p1/outside-voice#1 reader=outside-voice
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* Say the remote gate also leaves out declared test tree tests

Review-Finding: p1/adversarial-native#6 reader=adversarial-native
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* Keep always-run and remote-gate tests when a test tree is declared local-only

A [] on a test folder no longer drops an always-run test, no longer counts when it comes only from a branch's bootstrap policy, and no longer removes tests the remote gate or test backend owes. Tiers ran now names only tiers that ran a test.

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

* Reword the declared test tree release note into plain sentences

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

@@ -79,6 +79,7 @@ export const KNOWN_WINDOWS_INCOMPATIBLE: Array<{ file: string; reason: string }>
   { file: 'test/pregate-docs-lane-review.test.ts', reason: 'spawns bin/gstack-pregate through test/helpers/pregate-fixture.ts runBin (shebang via CreateProcess); the docs-lane selection rules it drives are POSIX-run like the other pregate fixtures' },
   { file: 'test/pregate-dart.test.ts', reason: 'its dart, flutter and fvm stand-ins are bash scripts on a colon-joined PATH, which Bun.which and CreateProcess cannot use on Windows, and its containment case needs a POSIX symlink; the Dart lane code it drives is POSIX-run like the other pregate fixtures' },
   { file: 'test/pregate-non-js.test.ts', reason: 'spawns bin/gstack-pregate through test/helpers/pregate-fixture.ts runBin and expects the Linux-host lanes verdict, like test/pregate-docs-lane-review.test.ts and test/pregate-selection.test.ts' },
+  { file: 'test/pregate-declared-test-tree.test.ts', reason: 'spawns bin/gstack-pregate through test/helpers/pregate-fixture.ts runBin and expects the Linux-host lanes verdict (the outside test runs in the local lane), like test/pregate-selection.test.ts' },
   { file: 'test/pregate-remote-gbrain.test.ts', reason: 'spawns bin/gstack-pregate through test/helpers/pregate-fixture.ts runBin (shebang via CreateProcess) and runs the gbrain-shaped ci:ubicloud package script through the POSIX lane runner, like test/pregate-remote.test.ts' },
   { file: 'test/pregate-remote-stamp-only.test.ts', reason: 'expects the Linux-host lanes verdict like test/pregate-remote.test.ts (on Windows the fixture\'s Linux lane is a requires-remote obligation) and skips itself on win32 (describe.skipIf), so the curated lane would run an empty file (#3485, #3486)' },
   // C-pregate: these drive bin/gstack-issue-links and bin/gstack-ship-receipt through