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/ui-conversation/src/client/skeleton/DetailsPanel.module.css

@@ -1,4 +1,4 @@
-/* Details third column, minimal P-I fill: header (name + close) over a
+/* Details third column, minimal fill: header (name + close) over a
    scrolling body of Input/Output code sections. Panel width/squeeze belongs
    to layout; this fills whatever the column gives. */
 

packages/client/ui-conversation/src/client/skeleton/InputBar.tsx

@@ -87,7 +87,7 @@ export function InputBar({
   // but its independent Stop below stays available while it runs.
   const continuable = subagent?.address.mode === 'continuable'
   const parentOffline = continuable && !subagent.parentAvailable
-  // Queue cut 1: running input stays free; locked = session removed, the
+  // Running input stays free; locked = session removed, the
   // inert no-workspace state, the machine faces absent (no session), or a
   // parent-offline continuable child. An owner block also disables input;
   // adjudicating and submitting render read-only so the draft stays visible.