test: register wave-3 carves (qa, browse, retro) — guards, touchfiles, pins, baselines

CARVE_GUARDS gains the three entries; qa's monolith invariant retires.
auq-format carve-safety now keys on the skeleton+sections union shipping
the AUQ block (first tier-1 carve: browse never renders it by design).
Baselines: parity v1.69.1.0 at 18 sectioned skills; ratchet recaptured.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/fixtures/context-budget.json

@@ -5,7 +5,7 @@
     "autoplan": 15337,
     "benchmark": 4856,
     "benchmark-models": 3829,
-    "browse": 10212,
+    "browse": 7022,
     "browser-skills/hackernews-frontpage": 371,
     "canary": 9921,
     "careful": 919,
@@ -48,9 +48,9 @@
     "plan-devex-review": 16141,
     "plan-eng-review": 13081,
     "plan-tune": 14088,
-    "qa": 17873,
+    "qa": 12582,
     "qa-only": 12355,
-    "retro": 19313,
+    "retro": 17894,
     "review": 14374,
     "scrape": 3939,
     "setup-browser-cookies": 3119,