Initialize gitea-agent harness

.gitignore

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+# Runtime repository mirrors and worktrees
+/repositories/
+
+# Harness-generated runtime and review artifacts
+/harness/.review-runs/
+/harness/.runtime/
+
+# Python environments and caches
+**/.venv/
+**/__pycache__/
+**/.pytest_cache/
+**/.ruff_cache/
+**/.mypy_cache/
+*.py[cod]
+
+# Local credentials and environment overrides
+.env
+.env.*
+!.env.example
+*.pem
+*.key
+
+# Logs and local OS/editor files
+*.log
+.DS_Store
+.vscode/
+.idea/