Task 03: Prove Executor-Specific Behavior

Acceptance

Desktop Playwright coverage proves unsupported capability hides embedded VS Code while retaining a compatible editor, and supported capability shows it independently of browser platform.
Capability test routing rewrites only the correlated task.session.status response and proxies every unrelated WebSocket frame unchanged.
Phone-viewport coverage retains the intentional mobile topbar, absence of desktop editor controls, and no horizontal overflow without relying on boot host metadata.

Verification

From apps/:

pnpm --filter @kandev/web e2e:run -- tests/task/executor-embedded-vscode-availability.spec.ts -- --project=chromium
pnpm --filter @kandev/web e2e:run -- tests/task/mobile-executor-embedded-vscode-availability.spec.ts -- --project=mobile-chrome

If the WebSocket helper has extractable pure frame-rewrite logic, add and run its focused Vitest test before Playwright. Do not add a test-only production API or runtime flag.

Files likely touched

apps/web/e2e/helpers/session-capabilities.ts (new)
apps/web/e2e/tests/task/executor-embedded-vscode-availability.spec.ts (replace old host-platform spec)
apps/web/e2e/tests/task/mobile-executor-embedded-vscode-availability.spec.ts (rename and update)
apps/web/e2e/tests/task/windows-host-embedded-vscode-availability.spec.ts (remove)
apps/web/e2e/tests/task/mobile-windows-host-embedded-vscode-availability.spec.ts (remove)

Dependencies

Task 02 supplies the active-session UI behavior and removes the boot-host helper.

Parallelism

Parallel-safe with Task 04 only when the user explicitly authorizes subagents. Otherwise run sequentially in the primary conversation.

Inputs

Spec scenarios 1–3, 8, and 9.
Plan section: E2E tests.
Existing WebSocket proxy pattern: apps/web/e2e/helpers/ws-drop.ts.
Existing supported launch smoke: apps/web/e2e/tests/settings/vscode-open-panel.spec.ts.

Risks

Correlate request IDs; do not mutate every response containing a capabilities key.
Preserve newline-delimited frames and binary frames exactly when they are not the target.
Avoid starting code-server in menu-availability tests; the existing launch smoke owns that cost.

Output contract

Report scenarios covered, files replaced/removed, exact Playwright results, and any fixture limitations. Update this task to done and its plan checkbox/status.

Completion record

Replaced both host-platform specs with executor-capability desktop and mobile specs. Added a WebSocket proxy helper that records only task.session.status request IDs, rewrites only their response capability, and forwards all other frames unchanged.
./e2e/scripts/run-e2e.sh --no-build --project chromium -- tests/task/executor-embedded-vscode-availability.spec.ts passed: 2 tests.
pnpm e2e:run -- tests/task/mobile-executor-embedded-vscode-availability.spec.ts --project=mobile-chrome passed: 1 test.
The desktop suite covers unsupported-session filtering with a retained custom editor and a supported capability under a Windows browser platform. The mobile suite confirms the compact header, no desktop editor control, and no horizontal overflow.

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