feat(git-commit): add git-commit skill documentation and configuration (#188)

### Linked issue

<!-- No linked issue -->

### Context

Adds the \`git-commit\` agent skill sourced from
\`github/awesome-copilot\`, enabling Copilot to generate conventional
commit messages intelligently from diffs within this project.

### Description

- Introduced \`.agents/skills/git-commit/SKILL.md\` — full skill
definition for executing git commits using the Conventional Commits
specification. Covers type/scope detection, intelligent file staging,
interactive overrides, and footer generation (breaking changes, issue
refs).
- Added \`skills-lock.json\` — registers the skill with its source,
path, and integrity hash so the skill runtime can resolve and verify it
reproducibly.

The skill is invoked when the user asks to commit changes or uses
\`/commit\`. It auto-detects the conventional type and scope from the
diff, generates a message, and supports interactive overrides before
committing.

Author: RedStar071

.agents/skills/git-commit/SKILL.md

@@ -0,0 +1,124 @@
+---
+name: git-commit
+description: 'Execute git commit with conventional commit message analysis, intelligent staging, and message generation. Use when user asks to commit changes, create a git commit, or mentions "/commit". Supports: (1) Auto-detecting type and scope from changes, (2) Generating conventional commit messages from diff, (3) Interactive commit with optional type/scope/description overrides, (4) Intelligent file staging for logical grouping'
+license: MIT
+allowed-tools: Bash
+---
+
+# Git Commit with Conventional Commits
+
+## Overview
+
+Create standardized, semantic git commits using the Conventional Commits specification. Analyze the actual diff to determine appropriate type, scope, and message.
+
+## Conventional Commit Format
+
+```
+<type>[optional scope]: <description>
+
+[optional body]
+
+[optional footer(s)]
+```
+
+## Commit Types
+
+| Type       | Purpose                        |
+| ---------- | ------------------------------ |
+| `feat`     | New feature                    |
+| `fix`      | Bug fix                        |
+| `docs`     | Documentation only             |
+| `style`    | Formatting/style (no logic)    |
+| `refactor` | Code refactor (no feature/fix) |
+| `perf`     | Performance improvement        |
+| `test`     | Add/update tests               |
+| `build`    | Build system/dependencies      |
+| `ci`       | CI/config changes              |
+| `chore`    | Maintenance/misc               |
+| `revert`   | Revert commit                  |
+
+## Breaking Changes
+
+```
+# Exclamation mark after type/scope
+feat!: remove deprecated endpoint
+
+# BREAKING CHANGE footer
+feat: allow config to extend other configs
+
+BREAKING CHANGE: `extends` key behavior changed
+```
+
+## Workflow
+
+### 1. Analyze Diff
+
+```bash
+# If files are staged, use staged diff
+git diff --staged
+
+# If nothing staged, use working tree diff
+git diff
+
+# Also check status
+git status --porcelain
+```
+
+### 2. Stage Files (if needed)
+
+If nothing is staged or you want to group changes differently:
+
+```bash
+# Stage specific files
+git add path/to/file1 path/to/file2
+
+# Stage by pattern
+git add *.test.*
+git add src/components/*
+
+# Interactive staging
+git add -p
+```
+
+**Never commit secrets** (.env, credentials.json, private keys).
+
+### 3. Generate Commit Message
+
+Analyze the diff to determine:
+
+- **Type**: What kind of change is this?
+- **Scope**: What area/module is affected?
+- **Description**: One-line summary of what changed (present tense, imperative mood, <72 chars)
+
+### 4. Execute Commit
+
+```bash
+# Single line
+git commit -m "<type>[scope]: <description>"
+
+# Multi-line with body/footer
+git commit -m "$(cat <<'EOF'
+<type>[scope]: <description>
+
+<optional body>
+
+<optional footer>
+EOF
+)"
+```
+
+## Best Practices
+
+- One logical change per commit
+- Present tense: "add" not "added"
+- Imperative mood: "fix bug" not "fixes bug"
+- Reference issues: `Closes #123`, `Refs #456`
+- Keep description under 72 characters
+
+## Git Safety Protocol
+
+- NEVER update git config
+- NEVER run destructive commands (--force, hard reset) without explicit request
+- NEVER skip hooks (--no-verify) unless user asks
+- NEVER force push to main/master
+- If commit fails due to hooks, fix and create NEW commit (don't amend)

skills-lock.json

@@ -0,0 +1,11 @@
+{
+	"version": 1,
+	"skills": {
+		"git-commit": {
+			"source": "github/awesome-copilot",
+			"sourceType": "github",
+			"skillPath": "skills/git-commit/SKILL.md",
+			"computedHash": "2607fc60629b82b257136dd2a7a373f0a4466c0b49df7746d845d59313c99b21"
+		}
+	}
+}