docs: fix round-3 review findings — §/used-to/v1 residuals, zh stamp example, budget freeze honored

Delete the three §-citation residuals (web-app cordis.patch.yml, two
client design.md §-headers); recast the two CSS used-to narrations and
hmr's four v1 labels as current-state prose; narrow the zh exemption
example to 'this cut' (「本版本」 legitimately renders 'This version');
extend the candidate gate list with the post-battery shapes (§\d with a
committed-owner carve-out, 'used to', bare v1) on both sides and
re-record; honor the over-target ceiling freeze — docs/AGENTS.md
condensed to 1320 and the ceiling restored to 1320.

packages/client/ui-slots/tests/type-chain.spec.tsx

@@ -1,4 +1,4 @@
-// Terminal-design compile-time samples (design.md §11 item 2): the four-share
+// Terminal-design compile-time samples: the four-share
 // composed register constraint — children spec x SlotMap alignment, renderSlot
 // key-set containment, store share matching, inject face completeness — plus
 // the full positive chain. Bodies with @ts-expect-error sites never run.