ci(lint): de-number the optional-error sink-contract step comment (#12290)

The step's comment pinned a census of a moving tree in prose that nothing
re-measures: "13 cases ... 36 sink types, 15 baselined". Every number was
wrong, and the baselined figure had been wrong since the ledger paydown --
a reader trusting it believed there were fifteen outstanding sink repairs.

The gate prints all three figures live on every run, so the comment does not
need a copy. Drop the counts and keep the facts that do not drift: runs its
own --self-test first, AST over packages/**, no spawns, ~3.5 s, and the
no-`paths:`-filter rationale.

Also drops "both narrowings", which had itself gone stale -- the gate now
pins three and its self-test prints "all three narrowings".

Part of #11551


Claude-Session: https://claude.ai/code/session_01UjM2ia8Av1v5NqfqQEQmC6

Co-authored-by: Claude <noreply@anthropic.com>

Author: yinlianghui

.github/workflows/lint.yml

@@ -1778,9 +1778,11 @@ jobs:
       # it enforced nothing, while reading in `package.json` exactly like the
       # gates that do. That is #10574's defect one file over, and it is the only
       # thing this change repairs; the gate itself is untouched.
-      # Runs its own --self-test FIRST (13 cases, both directions, both
-      # narrowings pinned as counts), then the scan — 36 sink types, 15
-      # baselined shrink-only. AST over packages/**, no spawns; ~3.5 s.
+      # Runs its own --self-test FIRST (both directions, every narrowing pinned
+      # as a count), then the scan. Deliberately carries NO counts: the run
+      # prints its own census — self-test cases, sink-type population, and the
+      # baselined shrink-only total — so a copy here could only ever be a stale
+      # one, and was. AST over packages/**, no spawns; ~3.5 s.
       # No `paths:` filter, for the standard reason: a filter on `packages/**`
       # would go dormant on the PR that edits the baseline.
       - name: Optional-`error` sink contract