Setup commit messages standards

.charlie/commands/commit.md

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+---
+allowed-tools: Bash(git add:*), Bash(git status:*), Bash(git commit:*)
+description: Analyze changes and create a high-quality git commit
+---
+
+## Context
+
+- Current branch: !`git branch --show-current`
+- Working tree status: !`git status --short --branch`
+- Unstaged changes: !`git diff`
+- Staged changes: !`git diff --cached`
+- Recent history (if available): !`git log --oneline -10 || echo "No commits yet"`
+
+## Your task
+
+Analyze the context above and:
+
+1. Summarize the intent of the changes.
+2. Explain why those changes are important
+3. Commit the changes `git commit -m "<generated message>"`.
+4. Add `Assisted-by: {{agent_name}} (<Model>)`

.charlie/rules/commit-messages.md

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+---
+description: "Commit messages guidelines"
+---
+
+- Title
+  - Contains 5-116 characters
+  - Start with capital letter (A-Z)
+  - Use imperative mood ("Add feature" not "Added feature")
+  - No ticket numbers (use footer instead)
+  - No trailing whitespace
+- Body
+  - Explain WHY and maybe a bit of HOW
+  - Empty line required between title and body
+  - Max 116 characters per line (except URLs, code blocks, footer annotations)
+  - Minimum 5 characters
+- Footer
+  - Use trailers:
+    - `Reference: https://example.com`
+    - `Assisted-by: Tool/Agent (<Model/Version>)`
+- AI attribution
+  - Add `Assisted-by: {{agent_name}} (<Model/Version>)`
+  - If you're not sure which model is being used, ask the user or don't mention it.