v1.92.57.0 fix(hermes): plain skill-start fence that Tirith can resolve, so Hermes can start gstack skills (GST-882) (#3825)

* fix: plain skill-start fence that a static resolver can follow (GST-882)

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

* fix: checked-in renders keep the lookup as plain lines; regenerate goldens, lower size pins (GST-882)

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

* test: Codex preamble expectation follows the plain start lookup (GST-882)

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

* fix: pre-landing review fixes (runtime-root header documents the plain skill-start fence, GST-882)

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

* fix: Step 11 review fixes: troubleshooting names the skill-start exception; parity test pins the start lookup to the later-fence root (GST-882)

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

* fix: type the parity test's env so the test typecheck ratchet stays clean (GST-882)

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* docs: changelog fragment for GST-882

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* test: writing-style Codex fence expectation follows the plain start lookup (GST-882)

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

docs/troubleshooting.md

@@ -880,7 +880,11 @@ pick a new `--output`), then copy the recovery file to where you want it.
 **Meaning.** On Codex, Factory, OpenCode, Cursor, Copilot and Kiro every bash
 block finds gstack on its own: an exported `GSTACK_ROOT` (with `bin/` and
 `lib/`), then a repo-local install, then the host's global install
-(`$CODEX_HOME/skills/gstack` on Codex). None existed.
+(`$CODEX_HOME/skills/gstack` on Codex). None existed. A skill installed for one
+folder (Hermes, or the Codex install `./setup` writes) is the exception for its
+first block: that block runs the folder's own `bin/gstack-skill-start` and
+ignores an exported `GSTACK_ROOT`. When the folder is missing, the block prints
+this line and its start command then fails.
 
 **Fix.**