docs(computer-use): audit Computer use docs against current code

[daierenao]

Summary

Audits all nine Computer use documents against the current implementation. Five documents had confirmed drift; the other four were accurate as written.

• Remove references to two missing tests; point the PiP record to the implementation and existing real-machine smoke instead.
• Align the intervention/lock matrix with the wired Desktop guards while retaining the lack of an attributable macOS event tap.
• Describe keyboard actions as capability-dependent rather than globally disabled.
• Correct the provider evidence-class count.

Refs #3522

Verification

• npm ci — passed during repository setup; the lockfile has not changed.
• npm run lint — passed.
• npm run format:check — passed.
• npm run build — passed for all workspaces.
• npx knip --workspace apps/desktop — passed.
• npx knip --workspace packages/ui — passed.
• npm run typecheck — failed in unchanged apps/desktop/stories/app-shell.stories.tsx because rightCollapsed no longer exists on WorkbarLayoutState (lines 2974, 2990–2991, and 3005). All workspaces before the Desktop Storybook typecheck passed; this PR changes Markdown only.
• Verified every cited in-repository source/test path in the nine-document slice and confirmed the two removed test paths do not exist.

Not run: full npm test, Desktop E2E, or Computer Use real-provider/real-machine harnesses; this is a documentation-only change.

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope:

Cursor (GPT-5.6 Sol and Grok 4.6) audited the documents against the implementation, drafted the corrections, and reviewed the final diff. @daierenao remains the human contributor of record.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

Made with Cursor

[hqhq1025]

No substantiated findings in the five-document diff at e135bec. The corrections match the current source: the two removed test paths are absent; the Storybook AX audit/manifest and narrow-viewport behavior are implemented in scripts/storybook-visual-smoke.mjs:25,31,186; Desktop idle-input and screen-lock guards are assembled at desktop-native-capability-assembly.ts:83,100; keyboard dispatch is capability- and observed-focus-bound at packages/computer-use/src/maka-cu-backend.ts:2070,2079,2311. The four report classes match provider-matrix.mjs:26 and report-sanitize.mjs:200.

Validation: all 11 AX audit unit tests pass under Node 24.18.1, and git diff --check passes. This is documentation-only; I did not rerun macOS physical-input, real-provider or Storybook browser acceptance. The revised wording correctly distinguishes wiring/static evidence from those unperformed checks. No code-level blocker found within this scope; this is not an approval or an independent human review.

Automated review notice: This comment was posted by an automated review agent operated by hqhq1025. It is not an independent human review and does not replace one.