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

plugins/git/skills/pc-run/references/README.md

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+# references/
+
+| File | Purpose |
+|---|---|
+| `failure-patterns.md` | Hook failure causes and concrete fix suggestions — loaded when hooks fail |
+| `sources.md` | Provenance: research sources that informed this skill |

plugins/git/skills/pc-run/references/failure-patterns.md

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+---
+source_keys:
+  - context7-pre-commit-com
+  - pre-commit-com
+---
+
+# Hook Failure Patterns
+
+Common hook failure causes and concrete next-step suggestions.
+
+## Hook modified files — commit blocked
+
+Cause: A fixer hook (e.g. `trailing-whitespace`, `end-of-file-fixer`, `pretty-format-json`) modified staged files. The commit is blocked because the staged version is now stale.
+
+Fix: Re-stage and recommit.
+```bash
+git add -u
+git commit -m "same message"
+```
+
+## Secret detected (gitleaks)
+
+Cause: gitleaks found a high-entropy string or known secret pattern in a staged file.
+
+Suggestions:
+- If it's a false positive: add a `# gitleaks:allow` inline comment, or add the path to `.gitleaksignore`.
+- If it's a real secret: remove it from the file, rotate the credential, then commit.
+
+## Shellcheck warning
+
+Cause: shellcheck found a shell script issue. The output includes the file path, line number, and SC-code.
+
+Fix: Look up the SC-code on shellcheck.net or pass `--explain SCxxxx` to shellcheck for a detailed explanation. The most common fixes:
+- SC2086 (unquoted variable): wrap in double quotes.
+- SC2046 (unquoted command substitution): wrap in double quotes.
+- SC2181 (check exit code of `$?`): use `if command; then` directly.
+
+## pretty-format-json fails but doesn't fix
+
+Cause: `pretty-format-json` requires `args: [--autofix]` to modify files. Without it, the hook only fails.
+
+Fix: The user (or `pc-author`) must add `args: [--autofix]` to the hook override in `.pre-commit-config.yaml`.
+
+## Environment stale or broken
+
+Cause: A hook's cached environment is corrupted or out of date.
+
+Fix:
+```bash
+pre-commit clean          # wipe all environments
+pre-commit install-hooks  # rebuild everything
+```
+
+Or less destructively:
+```bash
+pre-commit gc             # remove only unused environments
+```
+
+## Hooks don't run on `git commit`
+
+Cause: `pre-commit install` was never run in this clone.
+
+Fix: `pre-commit install`. Git hooks are per-clone — they are not committed to the repo.
+
+## Hook runs but matches wrong files (or no files)
+
+Cause: The `files:` pattern uses `re.search()` not full-string match. A pattern that looks correct may match unexpectedly.
+
+Diagnosis: `identify-cli <filename>` shows the type tags for a file. Verify `types:` filters against these.
+
+## stages mismatch — hook never fires
+
+Cause: Hook is defined for a stage (e.g. `pre-push`) but `pre-commit install` was not run with `-t pre-push`.
+
+Fix:
+```bash
+pre-commit install -t pre-commit -t pre-push -t commit-msg
+```
+
+Or add `default_install_hook_types` to `.pre-commit-config.yaml` and re-run `pre-commit install`.
+
+## `validate-config` schema error
+
+Common causes:
+- Missing `id` under a hook block
+- Missing `rev` under a non-local repo block
+- `repo: local` hook missing `language` or `entry`
+- Indentation error (valid YAML but invalid pre-commit schema)

plugins/git/skills/pc-run/references/sources.md

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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/failure-patterns.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/failure-patterns.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:** (none)
+- **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
+- **Contributing files:** (none)
+- **Research doc:** plugins/kyberforge/docs/research/docs/pre-commit/sources.md
+- **Status:** `extracted`