ci(lint): keep the ADR symbol-anchor sweep out of its collector block

`check-step-collectors --self-test` was red on this branch:

    • lint.yml "ADR symbol anchors resolve (no line numbers survive)":
      all green => every command runs (3/2)

The counts are (executed / collected), so three ran where two were collected —
not the reverse. That gate drives the real `run:` block under `bash -e` with a
STUB planted at each collected command's SCRIPT PATH, then holds "all green =>
every command runs" as an equality. The step ended with a bare
`node scripts/check-adr-symbol-anchors.mjs` after the collector's exit guard,
which re-invokes the very stub planted for that script's `--self-test` entry —
a third execution against two collected commands.

Split into two steps: the collector carries the two self-tests and nothing
else, and the production sweep is its own step. That is also the shape both
existing collectors in this file already have, and it restores the property
the split was for — the sweep now runs on its own footing instead of behind
the self-tests' `exit 1`.

⛔ No scope change: `docs/adr/**`, the resolver and its corpus registration are
untouched. Both invocations the gate's own `--self-test` pins in lint.yml are
still present, so the wiring assertion still holds.

Refs #13556

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Mszp61SetNhQfVGvWh9bNn

Author: claude

.github/workflows/lint.yml

@@ -2181,7 +2181,17 @@ jobs:
       # chained second self-test is neither green nor red — it never runs
       # (#10814). The collector runs both unconditionally and fails at the end
       # naming every one that broke.
-      - name: ADR symbol anchors resolve (no line numbers survive)
+      #
+      # ⛔ AND THE PRODUCTION SWEEP IS A SEPARATE STEP, which is not cosmetic.
+      # `check-step-collectors` drives this very block under a real `bash -e`
+      # with a STUB planted at each collected command's script path, and holds
+      # "all green => every command runs" as an equality. A trailing
+      # `node scripts/check-adr-symbol-anchors.mjs` in the same block re-invokes
+      # that same stub, so the harness counts 3 executions against 2 collected
+      # commands and the gate reds (3/2) — which is exactly what it did here.
+      # Both existing collectors in this file carry self-tests ONLY, for the
+      # same reason. Keep the sweep out of the collector block.
+      - name: ADR symbol-anchor gate self-tests
         run: |
           failed=""
           run_self_test() {
@@ -2202,7 +2212,9 @@ jobs:
             printf "%s" "$failed"
             exit 1
           fi
-          node scripts/check-adr-symbol-anchors.mjs
+
+      - name: ADR symbol anchors resolve (no line numbers survive)
+        run: node scripts/check-adr-symbol-anchors.mjs
 
       # NOTE: the standing platform test checklist (docs/qa/platform-checklist/)
       # is validated by `pnpm check:platform-checklist`, but by MAINTAINER