Configure bot-detection to use gpt-5.1-codex-mini for agent and detection jobs

[Copilot]

Bot-detection workflow was missing explicit model configuration, causing it to fall back to environment variables or defaults for both agent and detection steps.

Changes

• Added engine configuration to bot-detection.md frontmatter:

  engine:
    id: copilot
    model: gpt-5.1-codex-mini

This ensures both the agent job and detection job explicitly use gpt-5.1-codex-mini via --model flag in the compiled workflow, matching the pattern used by other workflows (ai-moderator, security-guard, ci-doctor).

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[Copilot]

Pull request overview

This PR pins the model used by the bot-detection agent workflow so it no longer falls back to environment variables/defaults, ensuring consistent execution across both the agent and detection jobs.

Changes:

• Added engine.id and engine.model frontmatter to the source workflow (bot-detection.md).
• Updated the compiled workflow (bot-detection.lock.yml) to pass --model gpt-5.1-codex-mini for both agent and detection runs and to set GH_AW_ENGINE_MODEL.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/bot-detection.md	Adds explicit Copilot engine/model configuration in workflow frontmatter.
.github/workflows/bot-detection.lock.yml	Regenerates compiled workflow to consistently use the pinned model in all relevant steps.

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