chore(sdui-parser): retire the objectui lockstep gate and its vendored record

One parser is kept (`@objectstack/sdui-parser`), so the gate that held two
copies byte-equal has nothing left to compare once the renderer's copy goes.
Removes `scripts/check-sdui-lockstep.mjs`, `packages/sdui-parser/objectui-lockstep.json`,
the `check:sdui-lockstep` / `gen:sdui-lockstep` scripts, the lint.yml step,
the NOT_DRIVER_MANAGED row and the measurement-triage row, and drops the
prose that pointed at the gate.

Claude-Session: https://claude.ai/code/session_01Xe3LjBvLrRVA6dmFUEGskm
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

.github/workflows/lint.yml

@@ -984,29 +984,6 @@ jobs:
         continue-on-error: true
         run: pnpm check:widget-option-census
 
-      # The sdui-parser LOCKSTEP invariant (#12719 / #13150). Two copies of the
-      # constrained-JSX parser exist: objectui's runs in the RENDERER, this one
-      # runs in the SAVE GATE, and #12719 states that they must byte-agree on
-      # the accepted grammar and on the diagnostic codes — an invariant that had
-      # been enforced by NOTHING through three manual ports, two of which landed
-      # only because someone happened to file a card naming the drift.
-      #
-      # Compared against a VENDORED RECORD of objectui's side, so this step
-      # needs no network, no build and no objectui checkout. Read the gate's
-      # header for what that buys and what it costs: it sees this copy moving
-      # away from the recorded objectui state; it does NOT see objectui moving
-      # afterwards, and only a `.objectui-sha` bump — the moment a divergence
-      # starts SHIPPING — brings that direction back into view.
-      #
-      # Unfiltered on purpose. The record lives under packages/sdui-parser/, the
-      # pin is a root dotfile, and this workflow declares no paths: filtering it
-      # to the parser subtree would go dormant on exactly the PR that moves the
-      # pin. Cost is one TypeScript parse of seven small files, ~0.4 s.
-      - name: sdui-parser stays in lockstep with objectui's copy
-        id: sdui-parser-stays-in-lockstep-with-objectui
-        continue-on-error: true
-        run: pnpm check:sdui-lockstep
-
       # The checked-in SDUI public-tier manifest (#12924, ruled 2026-08-29: wire
       # it). `resolveSduiManifest()` degrades to parse-only SILENTLY when the
       # repo-root `sdui.manifest.json` is absent or unreadable, so nothing in

package.json

@@ -24,7 +24,6 @@
     "docs:start": "pnpm --filter @objectstack/docs start",
     "os": "node packages/cli/bin/run.js",
     "console:build": "turbo run build:dist --filter=@objectstack/console",
-    "gen:sdui-lockstep": "node scripts/check-sdui-lockstep.mjs --update",
     "lint": "node --stack-size=4000 node_modules/eslint/bin/eslint.js . --no-inline-config",
     "i18n:extract": "tsx packages/cli/bin/run-dev.js i18n extract packages/platform-objects/scripts/i18n-extract.config.ts --locales=zh-CN,ja-JP,es-ES --fill=default --source-hashes --out=packages/platform-objects/src/apps/translations",
     "check:i18n": "node scripts/check-i18n-bundles.mjs --self-test && node scripts/check-i18n-bundles.mjs",
@@ -39,7 +38,6 @@
     "check:bash32-floor": "node scripts/check-bash32-floor.mjs --self-test && node scripts/check-bash32-floor.mjs",
     "check:stack-collection-maps": "node scripts/check-stack-collection-maps.mjs --self-test && node scripts/check-stack-collection-maps.mjs",
     "check:widget-option-census": "node scripts/check-widget-option-census.mjs --self-test && node scripts/check-widget-option-census.mjs",
-    "check:sdui-lockstep": "node scripts/check-sdui-lockstep.mjs --self-test && node scripts/check-sdui-lockstep.mjs",
     "check:doc-authoring": "node scripts/check-doc-authoring.mjs --self-test && node scripts/check-doc-authoring.mjs",
     "check:doc-anchors": "node scripts/check-doc-anchors.mjs --self-test && node scripts/check-doc-anchors.mjs",
     "check:docs-single-h1": "node scripts/check-docs-single-h1.mjs --self-test && node scripts/check-docs-single-h1.mjs",