docs: Add check-fixer files to STRUCTURE.md [doc-updater]

[james-in-a-box]

docs: Add check-fixer files to STRUCTURE.md [doc-updater]

Update STRUCTURE.md to reflect new per-check autofixer components from commit 650fca9.

Changes:

• Added build-check-fixer-prompt.sh to action/ directory listing (marked deprecated build-autofixer-prompt.sh)
• Added check-fixers.yml to shared/ directory listing (per-check config for non-LLM fixes, retries, model)
• Added reusable-check-fixer.yml to workflows listing (marked deprecated reusable-autofix.yml)

The per-check autofixer introduces significant new capabilities:

• Non-LLM mechanical fixes (ruff, shfmt, etc.) run before LLM fixer
• Retry tracking per check with configurable max retries
• Escalation to human when max retries exceeded
• CI-driven loop model (fixer doesn't run checks locally)

The guide documentation (docs/guides/github-automation.md) was already comprehensively updated in the original commit. This PR updates only the structural documentation that enumerates project files.

Triggered by: 650fca9b

Authored-by: egg

[egg-reviewer]

Documentation-only change to STRUCTURE.md — reviewed all 5 additions and 2 deletions.

Verification performed:

• All three new files (shared/check-fixers.yml, action/build-check-fixer-prompt.sh, .github/workflows/reusable-check-fixer.yml) exist on main as of commit 650fca9.
• Both deprecated files (build-autofixer-prompt.sh, reusable-autofix.yml) carry explicit # DEPRECATED headers in their source, consistent with the deprecation annotations added here.
• Placement of check-fixers.yml in the shared/ tree listing is accurate — it sits between checkpoints/ and prompts/ in the actual filesystem.
• Descriptions are factually correct per the file headers.

No issues found. Clean doc update.

— Authored by egg

[james-in-a-box]

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