refactor(mcp): project prepare family output schema from its owning module

[thymikee]

Summary

Moves the single hand-authored MCP outputSchema entry for prepare out of src/mcp/command-output-schemas.ts into a frozen PREPARE_COMMAND_OUTPUT_SCHEMAS map exported from its owning module, src/commands/management/prepare.ts. This follows the #2810 projection seam already used on this stack by the replay, system, interaction, device-management, push-management, viewport, recording, and capture-wait families: command-output-schemas.ts now imports and spreads the family map instead of hand-authoring the entry, and PROJECTED_FAMILIES in command-tools-replay-schemas.test.ts gains the management-prepare entry so the disjointness check covers it. prepare's descriptor declares no post-action observation trait (#1652), so no settle-graft copy applies.

Part of #2819. 4 files touched. Stacked on refactor/mcp-output-schemas-2819-capture-wait-schema.

Validation

Tested at 02064bb5ee.

pnpm check:affected --run: all 164 affected test files / 1369 tests passed, including the new command-tools-management-prepare-schemas.test.ts (reference-equality + owner-file checks) and the updated disjointness test.

No device-facing behavior changed (pure MCP-schema-projection move; prepare is not even MCP-exposed). Proved it with a before/after JSON byte-diff of COMMAND_OUTPUT_SCHEMAS.prepare instead of a live device run:

{"type":"object","properties":{"action":{"type":"string","const":"ios-runner"},"platform":{"type":"string","enum":["ios","macos","android","harmonyos","vega","linux","web"]},"deviceId":{"type":"string"},"deviceName":{"type":"string"},"kind":{"type":"string","enum":["simulator","emulator","device"]},"durationMs":{"type":"number"},"runner":{"type":"object","properties":{}},"cache":{"type":"string","enum":["exact","miss","external"]},"artifact":{"type":"string","enum":["valid","rebuilt"]},"buildMs":{"type":"number"},"connectMs":{"type":"number"},"healthCheckMs":{"type":"number"},"xctestrunPath":{"type":"string"},"recoveryReason":{"type":"string"},"failureReason":{"type":"string"},"timing":{"type":"object","properties":{"totalMs":{"type":"number"},"additiveParts":{"type":"object","properties":{"buildMs":{"type":"number"},"connectAfterBuildMs":{"type":"number"},"healthCheckMs":{"type":"number"}},"required":["connectAfterBuildMs","healthCheckMs"]},"containment":{"type":"object","properties":{"connectMs":{"type":"array","items":{"type":"string","const":"buildMs"}},"healthCheckMs":{"type":"array","items":{"type":"string"}}},"required":["healthCheckMs"]},"note":{"type":"string"}},"required":["totalMs","additiveParts","containment","note"]},"message":{"type":"string"}},"required":["action","platform","deviceId","deviceName","kind","durationMs","runner","connectMs","healthCheckMs","timing","message"]}

This dump is byte-identical on the head commit and on origin/main (the entry on this stack was still byte-identical to origin/main before this move). No unresolved risk.

[github-actions]

Size Report

Metric	Base	Current	Diff
Installed (including dependencies)	4.88 MB	4.88 MB	+35 B
Package (unpacked)	4.88 MB	4.88 MB	+35 B
Package (download)	1.46 MB	1.46 MB	+17 B

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	23.4 ms	24.1 ms	+0.7 ms
CLI --help	66.1 ms	67.1 ms	+1.0 ms

[cubic-dev-ai]

No issues found across 4 files

_{Re-trigger cubic}

[thymikee]

Reviewed at 02064bb. This looks good: the prepare output schema and its tests move to the owning module unchanged. The new PUBLIC_PLATFORMS import in prepare.ts adds no eager edge, because @agent-device/kernel/device is already in the CLI import closure.

The Coverage failure is the same eager-closure budget check as on the rest of this stack, through src/commands/system/index.ts and src/commands/recording/index.ts, which this diff does not touch. The Smoke Tests failure does not overlap this diff.

Not blocking: DEVICE_KINDS and constSchema() in prepare.ts are copies of the ones in device.ts and command-output-schemas.ts. This is fine mid-migration, and one export can replace them when #2819 is done.

[thymikee]

Rebased onto the updated capture-wait branch; the head is now 0aeb0ad.

• Duplicate helpers (non-blocking note): prepare.ts no longer has its own copies of DEVICE_KINDS and constSchema(). It imports the shared constSchema from command-input.ts and DEVICE_KINDS from @agent-device/kernel/device, both already in the CLI import closure, so no new eager edge (commit 0aeb0ad). grep shows one constSchema declaration left in src/ and packages/.
• Coverage and Smoke Tests: the earlier failures were the eager-closure budget check through files this diff does not touch, and the iOS smoke flake. Please re-check them on the new head.
• Locally pnpm check:affected --run passes.

[thymikee]

The changes in 0aeb0ad look good. The earlier review at 02064bb was also clean, and this update only swaps two bindings in prepare.ts. The imported modules were already in that file's closure at 02064bb, so I read this as not adding a new import edge.

I did not run the eager-closure budget test or the MCP schema tests, so that reading comes from the imports only. Seven CI jobs are still running: Smoke (three), Repo Guards, Typecheck & Package, Coverage and Integration. The change touches no device or runner path, so I expect those jobs to pass. Please wait for them to finish green before merging.