[WIP] Update Avenger max-turns budget to match documented hard limit

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>[squad-plan] Tighten Avenger max-turns budget to match documented hard limit</issue_title>
<issue_description>## Objective
Reduce Avenger's max-turns frontmatter budget from 50 to a tighter limit that matches the prompt's own documented turn budget.

Issue context

Issue #50312 found Avenger frontmatter sets max-turns: 50, but the workflow's own "Execution Guidelines" state "Hard limit is 25 turns." The looser config allows expensive outlier runs (the highest-cost audited run also had the highest cache-read volume) and weakens budget enforcement (~3-5% estimated AIC savings on outliers).

Implementation guidance

• Edit .github/workflows/avenger.md.
• Change top-level max-turns from 50 to a tighter value, preferably 25 (matching the documented hard limit) unless a strong implementation reason justifies up to 30.
• Ensure the prompt wording and frontmatter stay consistent — there should be exactly one clear turn-budget story, not two conflicting numbers.
• Run make recompile after editing so the .lock.yml is regenerated.

Acceptance criteria

• Avenger frontmatter max-turns value is aligned with the prompt's documented guidance (no contradiction between the two).
• make recompile succeeds and the generated lock file updates cleanly with no unrelated diffs.

Dependency / ordering notes

Independent quick config/doc change; can be done in parallel with the Step 0 CI re-check fix. Consider bundling both Avenger markdown edits into one PR if per-issue assignment granularity isn't strictly required, since both touch the same file.

Generated by 🧑‍🤝‍🧑 Squad Plan · auto · 37.1 AIC · ⌖ 2.24 AIC · ⊞ 9.5K · ◷
_{Comment /squad-plan to run again}

• Closes [squad-plan] Tighten Avenger max-turns budget to match documented hard limit #50316

Comments on the Issue (you are @copilot in this section)

• Fixes [squad-plan] Tighten Avenger max-turns budget to match documented hard limit #50316