fix(server): align Codex collaboration prompts

[none23]

What Changed

Updated T3's copied collaboration prompts with the substantive changes from Codex 0.147:

• Plan mode prompt: added the current concise plan and plan-revision guidance.
• Default mode prompt: replaced the outdated claim that request_user_input is always unavailable.

Why

These prompts were originally copied from Codex but had drifted from their upstream versions. This keeps T3's collaboration modes aligned with current Codex behavior while limiting the change to the prompt text itself.

Fixes #5282
Supersedes #5990

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes - Not applicable
• I included a video for animation/interaction changes - Not applicable

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Note

Low Risk
Prompt-only changes to developer instructions; no auth, data, or runtime behavior paths are modified.

Overview
Plan mode developer instructions now tell the model to keep <proposed_plan> output concise by default, use a compact 3–5 section shape (summary, key changes, tests, assumptions), favor behavior-level bullets over file inventories, and cap detail unless the user wants more. It also adds rules for plan revisions in Plan mode: a new block must fully replace the prior plan, or the model should keep planning without a block when there isn’t enough to replace it; clarifying follow-ups can repeat the unchanged plan after answering.

Default mode no longer states that request_user_input is unavailable and errors; it now matches tool availability per turn—use that tool only when it appears in the turn’s tool list—while keeping the existing bias toward assumptions and direct plain-text questions when needed.

^{Reviewed by Cursor Bugbot for commit f4a0d0e. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Align Codex collaboration prompts for concise plans and conditional tool use

• Updates CodexDeveloperInstructions.ts to direct the assistant to produce compact plans (3–5 short sections: Summary, Key Changes, Test Plan, Assumptions), grouping bullets by subsystem rather than listing files individually.
• Adds follow-up revision rules for Plan mode: new <proposed_plan> blocks must be complete replacements, and the prior plan is reproduced unchanged after answering clarifying questions.
• Replaces the assertion that request_user_input is unavailable in Default mode with a conditional rule: use the tool only when it appears in the available tools for the current turn.

^{Macroscope summarized f4a0d0e.}

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Approvability

Verdict: Approved f4a0d0e

This PR updates prompt instruction text for Codex collaboration, adding guidance about keeping plans concise and well-structured. The changes are purely content/copy updates with no runtime logic impact.

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