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

plugins/git/skills/pc-author/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/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`