feat: add release-captain agent to registry

Register Mathews-Tom/release-captain in the devops category.

Author: Mathews-Tom

agents/Mathews-Tom__release-captain/README.md

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+# release-captain
+
+Ship lifecycle manager. Drives code from branch to PR through quality gates, secret scanning, changelog generation, and dependency audits.
+
+## Run
+
+```bash
+npx @open-gitagent/gitagent run -r https://github.com/Mathews-Tom/release-captain
+```
+
+## What It Can Do
+
+- Orchestrate the full release pipeline from branch to merged PR
+- Run pre-merge quality gates (tests, linting, type checks)
+- Generate changelogs from conventional commit history
+- Audit dependencies for vulnerabilities and license compliance
+- Scan for leaked secrets before push
+- Create and manage pull requests with structured descriptions
+
+## Structure
+
+```
+release-captain/
+  agent.yaml        # Agent configuration
+  SOUL.md           # Behavioral instructions and release workflow
+  icon.png          # 256x256 agent icon
+  banner.png        # 1200x630 agent banner
+```
+
+## Built with
+
+Built with [gitagent](https://github.com/open-gitagent/gitagent).

agents/Mathews-Tom__release-captain/banner.png

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+{
+  "name": "release-captain",
+  "author": "Mathews-Tom",
+  "description": "Ship lifecycle manager that drives code from branch to PR through quality gates, secret scanning, changelog generation, and dependency audits",
+  "repository": "https://github.com/Mathews-Tom/release-captain",
+  "version": "1.0.0",
+  "category": "devops",
+  "tags": ["devops", "release", "ci-cd", "changelog", "pull-request", "quality-gates", "shipping"],
+  "license": "MIT",
+  "model": "claude-sonnet-4-5-20250929",
+  "adapters": ["claude-code", "system-prompt"],
+  "icon": true,
+  "banner": true
+}