Checkpoint web parity through Chromium input tasks

docs/status/M13-01E.md

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+# M13-01E Status
+
+status: done  
+task: preserve Text data and unknown script sources through save/reopen  
+updated: 2026-08-18 America/New_York  
+enablingTask: false  
+parityStateChange: false
+
+## Scope
+
+The production WebEngine path opens `script_scene.blend`, saves it, starts a new engine Worker,
+and reopens the saved bytes. All three Text sources compare exact by metadata and source SHA-256;
+they remain read-only and `BLOCKED`, including the `use_module` autorun request. No source is
+rewritten or executed. This does not claim arbitrary script execution or add-on support.
+
+## Evidence
+
+- `UPDATE_SCRIPT_SAVE_REOPEN_REPORT=1 CHROME_PATH=/usr/bin/google-chrome-stable WEB_TEST_PORT=5498
+  node_modules/.bin/playwright test --config playwright.config.ts --workers=1
+  tests/e2e/script-save-reopen.spec.ts` passed 1/1. A second run without report update on port 5497
+  also passed against the same deterministic report.
+- `node tools/web/check-script-save-reopen.mjs` passed:
+  `script-save-reopen-ok sources=3 exact=true blocked=true savedBytes=490191 next=M13-01F`.
+- `npm --prefix web run typecheck` and `git diff --check` passed.
+
+## Artifact Hashes
+
+- checker: `7fc9a370cb472636e2699565cb21a1450e3cc8a2c90ffdcdff96533b344afa7c`
+- e2e: `481f78f3a0cce923b67ab14436cc23cbcd2ce66725de29dc874fea4fb5801227`
+- report: `0f6869a8ec8342ed87649312d2872ab2c172cbf12d6be81bb0b770ebcbe8a398`
+- manifest: `889a4e06f7e8c0ea55b3ca4baa9fe85dccbe97053e497a45e3d364ce2b70a7c6`
+- fixture: `2b8fbdb05419e1e61d64777998d6a3b2562f726c17f548cd1852efc723e1a037`
+
+## Next Task
+
+`M13-01F`: malicious Text, driver, handler, and embedded-module fixtures.
+
+## Rollback
+
+Remove the checker, e2e test, report, manifest, and this status entry. Restore M13-01D as the
+queue tail and move the machine queue back to M13-01E. No parity ledger rollback is required.