feat(cli): add per-task quiet mode

[RovingStone]

Adds per-task quiet mode to reduce build-log noise and avoid wasting agent context on repeated task UI. Task output, diagnostics, and CI integrations remain unchanged.

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Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Tasks can now set quiet = True to suppress informational task UI. Use --task:quiet[=BOOL] to override it per invocation.

Test plan

• New test cases added

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T21:38:38.852819Z	fbda0f2	PR opened

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Reviewed commit: fbda0f25c0

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