feat(git-master): add configurable commit footer and co-author options

Add git_master config with commit_footer and include_co_authored_by flags.
Users can disable Sisyphus attribution in commits via oh-my-opencode.json.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/features/builtin-skills/git-master/SKILL.md

@@ -529,6 +529,34 @@ IF style == SHORT:
 3. Is it similar to examples from git log?
 
 If ANY check fails -> REWRITE message.
+
+### 5.5 Commit Footer & Co-Author (Configurable)
+
+**Check oh-my-opencode.json for these flags:**
+- `git_master.commit_footer` (default: true) - adds footer message
+- `git_master.include_co_authored_by` (default: true) - adds co-author trailer
+
+If enabled, add Sisyphus attribution to EVERY commit:
+
+1. **Footer in commit body (if `commit_footer: true`):**
+```
+Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
+```
+
+2. **Co-authored-by trailer (if `include_co_authored_by: true`):**
+```
+Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
+```
+
+**Example (both enabled):**
+```bash
+git commit -m "{Commit Message}" -m "Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)" -m "Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>"
+```
+
+**To disable:** Set in oh-my-opencode.json:
+```json
+{ "git_master": { "commit_footer": false, "include_co_authored_by": false } }
+```
 </execution>
 
 ---

src/features/builtin-skills/skills.ts

@@ -622,6 +622,34 @@ IF style == SHORT:
 3. Is it similar to examples from git log?
 
 If ANY check fails -> REWRITE message.
+
+### 5.5 Commit Footer & Co-Author (Configurable)
+
+**Check oh-my-opencode.json for these flags:**
+- \`git_master.commit_footer\` (default: true) - adds footer message
+- \`git_master.include_co_authored_by\` (default: true) - adds co-author trailer
+
+If enabled, add Sisyphus attribution to EVERY commit:
+
+1. **Footer in commit body (if \`commit_footer: true\`):**
+\`\`\`
+Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
+\`\`\`
+
+2. **Co-authored-by trailer (if \`include_co_authored_by: true\`):**
+\`\`\`
+Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
+\`\`\`
+
+**Example (both enabled):**
+\`\`\`bash
+git commit -m "{Commit Message}" -m "Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)" -m "Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>"
+\`\`\`
+
+**To disable:** Set in oh-my-opencode.json:
+\`\`\`json
+{ "git_master": { "commit_footer": false, "include_co_authored_by": false } }
+\`\`\`
 </execution>
 
 ---