docs: outside-voice default and voice-models.json pin; Step 14.5 runs once on Sonnet (GSTA-167 PR B)

Adds the prb-docs-2 auditor's docs/unattended.md paragraph and fixes capy/skill/gstack/SKILL.md:49 at the same byte count (22,365 B), so the 5,312-token context-budget ceiling is unchanged. The ship-driver test pins the new 14.5 wording instead of the dropped haiku aside.

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

docs/unattended.md

@@ -228,6 +228,14 @@ credits outside coverage. A parent reads the rows with
 `gstack-review-read` and treats `outside_status: unavailable` as missing
 coverage, not as a clean outside review.
 
+The pass program (`lib/capy-review-pass.js`) picks the outside voice's model
+when `input.models['outside-voice']` is empty and the lane model is
+`anthropic/`: `openai/gpt-6.1-sol` at medium reasoning, the pairing the no-loss
+rounds ran. Any other lane must name a model. An outside voice from the same
+provider as the lane model or the native voice stops the pass (`STOP:`) before
+either voice is created, including on a rerun, and each outside voice prints an
+`OUTSIDE_VOICE:` line saying whether it is the certified configuration.
+
 ### The carry across a base merge or a test-only fix
 
 When the parent merges the base in or fixes a test after the receipt was