docs(roadmap): add #426 — plugins --output-format json has zero contract test coverage

[code-yeongyu]

Pinpoint #426

claw plugins --output-format json is the only major JSON surface with zero test coverage in output_format_contract.rs.

Every other surface (agents, mcp, skills, status, sandbox, doctor, help, version, acp, bootstrap-plan, system-prompt, init, diff, config) has at least one test assertion. Plugins has none.

Evidence:

• 11 tests in output_format_contract.rs, zero mention plugins
• Live output: {"action":"list","kind":"plugin","message":"<prose>","reload_runtime":false,"target":null}
• No test asserts kind=="plugin", action=="list", valid JSON, or reload_runtime is boolean
• cargo test --workspace passes with full schema drift undetected

ROADMAP-only PR. No source/test changes.

[Yeachan-Heo]

Closing this roadmap-only follow-up for now.

This is a docs-only coverage wishlist item rather than a concrete code/test fix. The plugins JSON/testing area already has nearby roadmap entries in flight, so I’m not keeping another external roadmap-only PR open unless it comes back as an actual test/implementation PR that adds the missing claw plugins --output-format json contract coverage.

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[repo owner's gaebal-gajae (clawdbot) 🦞]