Use supported Copilot model IDs in threat detection driver defaults

[Copilot]

The detection job was invoking unsupported model IDs in its two-phase driver, causing 400 The requested model is not supported and preventing detection output from being produced. This updates the default model names used by the detection path to supported Copilot IDs.

• Problem scope

  • The failure was isolated to default model selection in actions/setup/js/detection_job_driver.cjs (triage + full analysis phases).

• Changes

  • Updated Phase 1 default model from claude-haiku-4-5 to claude-haiku-4.5.
  • Updated Phase 2 default model from claude-sonnet-4-5 to claude-sonnet-4.5.
  • Kept environment override behavior unchanged (GH_AW_DETECTION_SMALL_MODEL, GH_AW_DETECTION_LARGE_MODEL).
  • Aligned inline documentation/comments with the new defaults.

• Code example

  // before
  const DEFAULT_SMALL_MODEL = "claude-haiku-4-5";
  const DEFAULT_LARGE_MODEL = "claude-sonnet-4-5";
  
  // after
  const DEFAULT_SMALL_MODEL = "claude-haiku-4.5";
  const DEFAULT_LARGE_MODEL = "claude-sonnet-4.5";

[Copilot]

Pull request overview

This PR fixes the threat-detection job’s two-phase driver defaults by switching Phase 1 (triage) and Phase 2 (full analysis) to supported Copilot model IDs, addressing the 400 The requested model is not supported failure when no environment overrides are provided.

Changes:

• Updated Phase 1 default model from claude-haiku-4-5 → claude-haiku-4.5.
• Updated Phase 2 default model from claude-sonnet-4-5 → claude-sonnet-4.5.
• Simplified the BYOK provider missing-env error message to a single process.stderr.write(...) call (no behavior change).

Show a summary per file

File	Description
actions/setup/js/detection_job_driver.cjs	Updates default model IDs used by the detection driver’s triage + analysis phases and aligns inline docs/error string formatting.

Copilot's findings

Tip

Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

• Files reviewed: 1/1 changed files
• Comments generated: 0