chore(ui-tooling): drop the page-key read census its card closed as not planned (slice 3 of #25920) (#26057)

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Part of #25920 — slice 3 of the unwired-tooling cleanup (slices 1 and 2:
#26004, #26024). The card stays open.

## Summary

Deletions only: 3 files, −1,147 lines, on `main` bbf7061.

- `ui/scripts/page-key-read-census.mjs` + its test + the
`census:page-key-reads` alias → **delete.** It was the instrument a
renderer-vs-`PageSchema` page-key gate would have read; that card
(objectui#9438) was closed as not planned on 2026-09-22. No gate or
workflow reads it; nothing but its own test and the alias names it.

## Scope changes found while preparing this slice

Two scripts the #26004 table listed as delete candidates are **not**
dead and move to the maintainer list instead:

- `tsconfig-test-parity-census.mjs` — five test comments in
`ui/packages/plugin-designer` and one in
`ui/packages/fields/tsconfig.test.json` deliberately tell readers to
read the `lib` level off `pnpm census:tsconfig-test-parity` instead of
restating it (objectui#9513). A live hand-run instrument.
- `dollar-dialect-alias-census.mjs` — deleting its test turns two cells
of `ui/scripts/__tests__/markdown-test-inputs.test.ts` red ("EVERY
tracked markdown document is an input", objectui#9096): its
`trackedFiles()` walk is the read that makes that class total, so
removing it would change which PRs the CI markdown exclusions let skip
the test shards. That is a CI behaviour change, not cleanup.
- Likewise `check-component-surface-parity.mjs`:
`ui/packages/types/src/navigation.ts` and
`ui/packages/plugin-map/src/index.tsx` point readers at `pnpm
check:component-surface-parity`.

Remaining delete work: `changeset-polarity-census` (its card
objectui#9727 closed after the rebuild), split in two PRs to stay under
the 3,000-line threshold. Then the mechanical tsconfig dedupe.

## Verification (head 714e17e)

- Exact-name `git grep` across the whole tree for the script, its test
and the alias: no hits outside the deleted files.
- ui suites that read the scripts inventory and manifest
(markdown-test-inputs, package-scripts-vitest-projects,
check-unreferenced-sources, ci-cd-pipeline-doc,
vitest-invocation-guard): 5 files, 192 tests passed.
`check:unreferenced-sources` and `check:test-path-roots` exit 0.
- `dispatch-gates --commands` families: per-family exit codes in the
report on the card.
- No changeset: private ui tooling and the private ui root manifest
only.

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

Author: objectstack-fleet[bot]

ui/package.json

@@ -50,7 +50,6 @@
     "census:body-dialect-producers": "node scripts/body-dialect-producer-scan.mjs",
     "census:tsconfig-test-parity": "node scripts/tsconfig-test-parity-census.mjs",
     "census:cross-file-line-citations": "node scripts/cross-file-line-citation-census.mjs",
-    "census:page-key-reads": "node scripts/page-key-read-census.mjs",
     "census:dollar-dialect-aliases": "node scripts/dollar-dialect-alias-census.mjs",
     "census:changeset-polarity": "node scripts/changeset-polarity-census.mjs",
     "check:new-line-citations": "node scripts/check-new-cross-file-line-citations.mjs",