plan(textarea-editor-v2): bite-sized TDD implementation plan
15 tasks covering: editor-src scaffold, vocab generator, srccfg
StreamLanguage mode, light/dark themes, autocomplete source, editor-entry
façade, esbuild build script + first bundle, tokens.css + editor.css,
editor.js glue (mount + submit-capture + __filesEditor alias),
_editor_assets.html partial, form-contract pytest pre-wiring gate,
template wiring with GET-asserts-markup TDD, files-overlay.js bridge
swap, Playwright e2e (autocomplete-accept + copy regression), docs +
final smoke.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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