docs: fix review findings — residual ordinals, hypothetical IPC row, citation-rule amendments

Purge the residual task/phase ordinals review caught ((T2), (queue cut 1)
×3, T6, P-I, 'this cut' ×6 including battery-expansion finds in two
untouched notes and a workflow JSDoc); drop the 'externally logged as
Decision 21' parenthetical and rename the remaining bare decision-21
mentions; mark the gui-layering IPC bridge row as a hypothetical example;
restore the GATE_NOTICE doc-typecheck clause and the py-types 'measured'
provenance; say subprocess-backed in filesystem.md; add the picker note
path. Amend the citations note: merged-PR evidence anchors in Agent Notes
are sanctioned, and the candidate gate patterns gain the four shapes the
sweep missed. All nine touched pairs re-recorded.

packages/client/runtime/tests/wire-events.spec.ts

@@ -1,5 +1,5 @@
 /**
- * Wire-to-typed-event bridge (web input-triggers cut 1): host/commands-changed
+ * Wire-to-typed-event bridge: host/commands-changed
  * → ctx 'commands/changed'; each established connection generation →
  * ctx 'connection/reset' (the forced cache-invalidation broadcast).
  */