revert(devx): leave dispatch-gates.mjs to PR #15570; its docblock correction moves to #15553

PR #15570 rewrites the same `SELF_TEST_VERDICT` region (it inserts the
`selfTestCaseLines` docblock directly after the sentence this branch edited), and
`git merge-tree` reports a conflict between the two, so this PR would go dirty
the moment that one lands. It is ahead in the queue and the serial-file rule
allows one live PR per hot file, so the hunk is dropped here rather than raced.

`scripts/pm/dispatch-gates.mjs` is restored from `origin/main`; its blob is
byte-identical to this branch's merge base (f9dbdd6
at cf6b671, at origin/main 0c5e973 and in the tree now), so no content from
the newer main comes in with it. Nothing else on this branch changes: the anchor
repair, the DECOY fixture and the `ENTRY_BY_HAND` row all live in
`scripts/measure-self-test-floor.mjs`.

The docblock there still tells readers the mechanical probe cannot read that
file, which this branch makes false. That correction is deferred to #15553 rather
than dropped.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012zGPuVVX3deAx9LdjK8jCk

Author: claude

scripts/pm/dispatch-gates.mjs

@@ -11495,12 +11495,12 @@ export function bannerLines({ identity, paths = [], drift = null }) {
  * "1288 cases pass" to zero bytes of output and exit 0 — a self-test that never
  * finished, reported as one that passed.
  *
- * The mechanical probe in `scripts/measure-self-test-floor.mjs` anchored on the
- * FIRST `function selfTest() {` in raw source until #14963 -- here a docblock
- * sentence, then a FIXTURE STRING -- so its injection landed inside a template
- * literal and produced only a SyntaxError. It anchors on the definition below
- * now, and that copy parses and runs; the entry is still read by hand there, and
- * the row's remaining NOT MEASURED is the probe's own artifact (#15515).
+ * The mechanical probe in `scripts/measure-self-test-floor.mjs` cannot read this
+ * file (its anchor matches the first `function selfTest() {` in the source, which
+ * here is a FIXTURE STRING, so the injection lands inside a template literal and
+ * only ever produces a SyntaxError). That is a limit of the instrument, not a
+ * property of this file, and it is why the entry is hand-read there. Anchoring an
+ * early return on the real definition below measures it in one run.
  */
 const SELF_TEST_VERDICT = 'dispatch-gates self-test reached its verdict';