fix(stream): pin every commit on this branch to a fix subject

.releaserc.json runs semantic-release off main, where feat: cuts a minor
version. This branch is a bugfix for a lockout that is live in the
published image, so it takes a patch, and the one feat: subject already
on the branch has been retitled to match.

Tasks 3 and 4 carry their commit messages in the plan text, which the
task briefs are extracted from verbatim, so the convention has to change
here or the next two implementers would reintroduce it.

Author: LoneAngelFayt

docs/superpowers/plans/2026-08-03-stream-gate-escape-hatch.md

@@ -16,7 +16,7 @@
   `grep -rnP '[\x{2010}-\x{2015}\x{2212}]' README.md root/ tests/ docs/`
 - **No trailing whitespace** (`311b320`, `62d1a34`).
 - **Every commit must be signed.** The repo has `commit.gpgsign=true` and the key signs without a prompt. Never pass `--no-gpg-sign`.
-- **Conventional commit subjects**: `feat(broker):`, `fix(stream):`, `docs:`, `chore:`. Bodies explain the why, in the style of the existing log.
+- **Every commit on this branch uses the `fix(<scope>):` subject.** Not `feat:`, not `docs:`, not `chore:`. `.releaserc.json` runs semantic-release off `main`, where `feat:` cuts a minor version and this branch is a bugfix for a shipped lockout, so it takes a patch. Scopes follow the existing log: `broker` for the Python service, `stream` for the gate and the stream path, `mod` for the s6 and image layer. Bodies explain the why, in the style of the existing log.
 - **Run the full suite and the linter before every commit:**
   ```bash
   python3 -m unittest discover -s tests -q && ruff check .
@@ -482,7 +482,7 @@ Expected: all pass (127 now), `All checks passed!`.
 
 ```bash
 git add root/root/broker.py tests/test_broker.py
-git commit -m "feat(broker): report the stream gate mode at startup and on /status
+git commit -m "fix(broker): report the stream gate mode at startup and on /status
 
 Running with the gate off is a real exposure, so it is stated rather than
 left to be deduced: the startup line names what is reachable (the
@@ -574,7 +574,7 @@ Expected: no syntax error, all tests pass, `All checks passed!`.
 
 ```bash
 git add README.md root/etc/s6-overlay/s6-rc.d/init-pcsx2-config/init.sh
-git commit -m "docs: say plainly that the stream gate ships off
+git commit -m "fix(stream): document that the stream gate ships off
 
 The Security section stated the token gate as settled fact, which stopped
 being true the moment STREAM_GATE landed. It now names the exposure in