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Configure Topchester project and user settings. Use when editing or explaining `topchester.jsonc`, `~/.config/topchester/config.jsonc`, model providers, command policy, ignore paths, hooks, project instruction files, or repo-scoped command approvals.

Review code for correctness, maintainability, security, and project fit.

Split larger work into ordered, verifiable implementation slices.

Quickly map an unfamiliar repository before changing it.

Debug failures by finding evidence and root cause before changing code.

Add or tighten tests before implementing a behavior change.

Use this skill when creating or updating planning documents for large changes, migrations, phased implementations, multi-PR work, risky refactors, staging validation, or any task that should be decomposed into ordered, reviewable slices with clear dependencies and verification.

Create or update working docs/plans handoff documents for larger engineering changes, including migrations and multi-module features. Use to split work into ordered implementation slices, resume from existing plans, preserve prior notes, append dated findings, track only verified progress, define per-slice verification, and keep follow-up work recoverable and reviewable.