chore(git): move pc skills from kyberforge to git plugin

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# pc-author
Create, add, remove, update, and configure `.pre-commit-config.yaml`.
## What it does
Manages the pre-commit configuration file in any git repo. When invoked, it scans the repo for languages, proposes appropriate hooks with rationale, and writes or modifies `.pre-commit-config.yaml`. It validates every write with `pre-commit validate-config` and flags stale revision pins. It does not run hooks or install them into `.git/hooks/` — use `pc-run` for that.
## Usage
```
/pc-author
```
Invoke with no arguments. The skill determines from context whether to create a new config or modify an existing one.
## Files
| File | Purpose |
|------|---------|
| `SKILL.md` | Skill instructions for agents |
| `references/hooks-by-language.md` | Hook recommendations by detected language/extension |
| `references/sources.md` | Provenance — research sources that informed this skill |

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---
name: pc-author
description: >
Use when the user wants to create, add hooks to, remove hooks from, update,
or configure .pre-commit-config.yaml. Triggers on: "set up pre-commit",
"add a hook", "remove this hook", "configure pre-commit", "create a pre-commit
config", "disable trailing whitespace hook", "add shellcheck", "update my
pre-commit config", even if the user does not name pre-commit explicitly.
Do not use for running hooks, installing git hooks, or bumping revision pins
— use pc-run for those.
allowed-tools: Bash Read Write Edit
metadata:
category: devtools
source_keys:
- context7-pre-commit-com
- pre-commit-com
- context7-pre-commit-hooks
- pre-commit-hooks-github
---
## Gotchas
- `rev` must be an immutable tag or commit SHA — never a branch name. `pre-commit autoupdate` breaks silently on branches.
- Fixers (`trailing-whitespace`, `end-of-file-fixer`, `pretty-format-json`) modify files but do NOT auto-stage them. The commit is blocked; the user must re-stage and recommit. Warn when adding fixers.
- `pre-commit validate-config` catches YAML structure errors and unknown hook IDs but does NOT download or run hooks. It is fast; run it after every write.
- When removing a hook leaves its repo block with zero hooks, delete the entire repo block — an empty `hooks: []` causes `validate-config` to fail.
- `language: system` and `language: script` are deprecated names. Use `language: unsupported` and `language: unsupported_script` for new local hooks.
## Route
Check before acting:
- `.pre-commit-config.yaml` does not exist → **Create from scratch**
- File exists → **Modify existing**
## Create from scratch
1. Run a shallow extension scan:
```bash
git ls-files | grep -oE '\.[a-z]+$' | sort | uniq -c | sort -rn
```
2. Read `references/hooks-by-language.md` to map detected extensions to recommended hooks.
3. State the proposed config in full before writing. Wait for user confirmation.
4. Write `.pre-commit-config.yaml`.
5. Run `pre-commit validate-config`. If non-zero: show the error, fix it, re-validate. Never leave a broken config.
## Modify existing
Read `.pre-commit-config.yaml` first. Note any stale `rev` values (see **Rev staleness** below) but do not change them.
### Adding a hook
1. Run a shallow extension scan to detect languages in the repo:
```bash
git ls-files | grep -oE '\.[a-z]+$' | sort | uniq -c | sort -rn
```
2. Read `references/hooks-by-language.md` for the correct repo URL, rev, and recommended args for any hook before writing.
3. Check for duplicates — if the same hook ID or equivalent tool already exists in the config, say so and stop.
4. If the hook's source repo already exists in the config, add the hook under that repo block. Otherwise append a new repo block.
5. State the proposed addition. Wait for confirmation.
6. Write. Run `pre-commit validate-config`. If non-zero: show error, fix, re-validate.
### Removing a hook
1. Identify the hook entry and its repo block.
2. State what will be removed: hook ID, and whether the parent repo block will also be deleted (if it would have zero hooks remaining). Wait for confirmation.
3. Remove the hook entry. If the repo block now has zero hooks remaining, remove the entire repo block.
4. Write. Run `pre-commit validate-config`. If non-zero: revert the edit, show the error, and stop — do not leave a broken config.
### Configuring top-level keys
Only when the user explicitly asks. Valid keys: `fail_fast`, `default_stages`, `default_language_version`, `minimum_pre_commit_version`, `exclude`, `files`, `default_install_hook_types`.
State the proposed change and wait for confirmation before writing.
## Rev staleness
When reading the config, for each repo listed in `references/hooks-by-language.md`, compare its `rev` in the user's config against the rev in that file. Flag any mismatch as potentially outdated and tell the user to run `pc-run` to autoupdate. Repos not in the reference cannot be checked — skip them silently. Do not modify `rev` values yourself.
## Scope boundary
This skill manages `.pre-commit-config.yaml` only. It does not:
- Author `.pre-commit-hooks.yaml` (publishing hooks for external consumers)
- Run `pre-commit install`
- Execute hooks or run the test suite
- Bump `rev` values
For those operations, use `pc-run`.

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---
source_keys:
- context7-pre-commit-com
- pre-commit-com
- context7-pre-commit-hooks
- pre-commit-hooks-github
---
# Hook Recommendations by Language / Context
Use this table when creating a config from scratch or recommending hooks to add.
Always check the existing config for duplicates before proposing.
## Universal (recommend for every repo)
| Hook ID | Repo | Rev | Rationale |
|---------|------|-----|-----------|
| `end-of-file-fixer` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Ensures files end with a newline — prevents spurious diffs |
| `trailing-whitespace` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Strips trailing whitespace — prevents invisible diff noise |
| `check-merge-conflict` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Catches unresolved merge markers before commit |
| `detect-private-key` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Blocks PEM private key material |
## Shell (`.sh`)
| Hook ID | Repo | Rev | Rationale |
|---------|------|-----|-----------|
| `shellcheck` | `https://github.com/jumanjihouse/pre-commit-hooks` | `3.0.0` | Static analysis for shell scripts; catches common errors |
Recommended args: `args: [--severity=warning]`
## Python (`.py`)
| Hook ID | Repo | Rev | Rationale |
|---------|------|-----|-----------|
| `check-ast` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Validates Python files parse as valid AST |
| `check-builtin-literals` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Enforces literal syntax for `dict()`, `list()` |
For formatting: check if `black`, `ruff`, or `isort` is already configured in `pyproject.toml` before recommending them.
## JSON (`.json`)
| Hook ID | Repo | Rev | Rationale |
|---------|------|-----|-----------|
| `check-json` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Validates JSON parses correctly |
| `pretty-format-json` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Auto-formats JSON (fixer — warns user to re-stage after commit) |
## YAML (`.yaml`, `.yml`)
| Hook ID | Repo | Rev | Rationale |
|---------|------|-----|-----------|
| `check-yaml` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Validates YAML parses correctly |
For Kubernetes/Helm YAML with custom tags, add `args: ['--unsafe']` and `exclude: ^helm/templates/`.
## TOML (`.toml`)
| Hook ID | Repo | Rev | Rationale |
|---------|------|-----|-----------|
| `check-toml` | `https://github.com/pre-commit/pre-commit-hooks` | `v6.0.0` | Validates TOML parses correctly |
## Secrets / security
| Hook ID | Repo | Rev | Rationale |
|---------|------|-----|-----------|
| `gitleaks` | `https://github.com/gitleaks/gitleaks` | `v8.21.2` | Scans for secrets and high-entropy strings |
## Commit message
| Hook ID | Repo | Rev | Stage | Rationale |
|---------|------|-----|-------|-----------|
| `conventional-pre-commit` | `https://github.com/compilerla/conventional-pre-commit` | `v2.4.0` | `commit-msg` | Enforces Conventional Commits format |
When adding commit-msg hooks, also add `default_install_hook_types: [pre-commit, commit-msg]` to the top-level config if not already present.
## Meta-validation (add last, after all other repos)
```yaml
- repo: meta
hooks:
- id: check-hooks-apply # catches hooks that match no files
- id: check-useless-excludes # catches exclude patterns that match no files
```
## Local hooks (repo: local)
Use for repo-specific scripts that don't belong in an external hook repo.
```yaml
- repo: local
hooks:
- id: run-tests
name: Run test suite
entry: bash tests/run-tests.sh
language: unsupported_script
pass_filenames: false
always_run: true
stages: [pre-push]
```
Language choices for local hooks:
- `unsupported` — system PATH tool (pre-commit does not manage env)
- `unsupported_script` — script at a repo-relative path
- `fail` — always-fail guard; `entry` text becomes the error message
- `python` — isolated venv; use `additional_dependencies` for pip packages

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# Sources
## context7-pre-commit-com
- **URL:** context7:/pre-commit/pre-commit.com
- **Description:** Official pre-commit.com documentation — installation, configuration schema, CLI reference, hook authoring, advanced features, troubleshooting
- **Contributing files:** SKILL.md, references/hooks-by-language.md
- **Research doc:** plugins/kyberforge/docs/research/docs/pre-commit/sources.md
- **Status:** `extracted`
## pre-commit-com
- **URL:** https://pre-commit.com/
- **Description:** Pre-commit framework homepage — full docs covering install, config, CLI, hook authoring, stages, local hooks, meta hooks, hazmat helpers, CI integration
- **Contributing files:** SKILL.md, references/hooks-by-language.md
- **Research doc:** plugins/kyberforge/docs/research/docs/pre-commit/sources.md
- **Status:** `extracted`
## context7-pre-commit-hooks
- **URL:** context7:/pre-commit/pre-commit-hooks
- **Description:** Official pre-commit-hooks collection — all available hook IDs with options and examples
- **Contributing files:** references/hooks-by-language.md
- **Research doc:** plugins/kyberforge/docs/research/docs/pre-commit/sources.md
- **Status:** `extracted`
## pre-commit-hooks-github
- **URL:** https://raw.githubusercontent.com/pre-commit/pre-commit-hooks/main/README.md
- **Description:** Official pre-commit-hooks README — complete hook listing with all args, categories, deprecated hooks, and latest version (v6.0.0)
- **Contributing files:** references/hooks-by-language.md
- **Research doc:** plugins/kyberforge/docs/research/docs/pre-commit/sources.md
- **Status:** `extracted`