fix: trim /qa's opening sentence by 4 bytes so the branch fits main's qa parity cap

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

gstack/llms.txt

@@ -56,7 +56,7 @@ Conventions:
 - [/plan-devex-review](plan-devex-review/SKILL.md): Interactive developer experience plan review.
 - [/plan-eng-review](plan-eng-review/SKILL.md): Eng manager-mode plan review.
 - [/plan-tune](plan-tune/SKILL.md): Self-tuning question sensitivity + developer psychographic for gstack (v1: observational).
-- [/qa](qa/SKILL.md): Use when you test the site, API or CLI and fix its bugs.
+- [/qa](qa/SKILL.md): Use when you test the site, API or CLI and fix bugs.
 - [/qa-only](qa-only/SKILL.md): Report browser/API/CLI/job/worker/webhook bugs.
 - [/retro](retro/SKILL.md): Weekly engineering retrospective.
 - [/review](review/SKILL.md): Use when you review this PR's diff.

qa/SKILL.md

@@ -2,7 +2,7 @@
 name: qa
 preamble-tier: 4
 version: 2.0.0
-description: Use when you test the site, API or CLI and fix its bugs. (gstack)
+description: Use when you test the site, API or CLI and fix bugs. (gstack)
 allowed-tools:
   - Bash
   - Read

qa/SKILL.md.tmpl

@@ -3,7 +3,7 @@ name: qa
 preamble-tier: 4
 version: 2.0.0
 description: |
-  Use when you test the site, API or CLI and fix its bugs.
+  Use when you test the site, API or CLI and fix bugs.
   Covers browser/API/CLI/job/worker/webhook bugs and commits verified fixes atomically.
   Fits "qa", "QA", "qa test this", "test this site", "find bugs", "find bugs on site",
   "test and fix", or "fix what's broken".