chore(ui-tooling): drop the changeset polarity census and its alias (slice 5 of #25920) (#26107)

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_Requested by **Elon** · [project
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Part of #25920 — slice 5 of the unwired-tooling cleanup (slices 1–4:
#26004, #26024, #26057, #26098). The card stays open.

## Summary

Deletions only: 2 files, −1,882 lines, on `main` 9c79640.

- `ui/scripts/changeset-polarity-census.mjs` + the
`census:changeset-polarity` alias in `ui/package.json` → **delete.** The
census was the instrument for objectui#9727, which closed after the
rebuild. Its test and fixture corpus went in #26098; the alias was the
only reference left. No gate, workflow or document runs it.

Next and last code slice: the mechanical tsconfig dedupe.

## Verification (head 17a229c)

- Exact-name `git grep` across the whole tree for `changeset-polarity`:
no hits outside `CHANGELOG.md` history lines. Nothing in AGENTS.md,
`skills/**` or `.claude/**` names it.
- ui suites that read the scripts inventory and manifest
(markdown-test-inputs, package-scripts-vitest-projects,
check-unreferenced-sources, vitest-invocation-guard): 4 files, 107 tests
passed.
- `check:unreferenced-sources`, `check:test-path-roots`,
`check-ci-filter-parity` and its `--self-test`,
`check:commit-card-trailers`: 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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Code](https://claude.ai/code/session_012eXtKYmXEnCc1GExP4go12)_

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_012eXtKYmXEnCc1GExP4go12

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

Author: objectstack-fleet[bot]

ui/package.json

@@ -51,7 +51,6 @@
     "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: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",
     "check:control-bytes": "node scripts/check-control-bytes.mjs",
     "check:published-dist": "node scripts/check-published-dist-tooling.mjs",