implements full pull request support for tangled MCP:
features #
- create_repo_pull - create PRs with title, body, base, head, patch
- list_repo_pulls - list all PRs for a repo
- get_repo_pull - get detailed PR information
- update_repo_pull - update PR metadata
implementation details #
- follows the same pattern as issues
- client-side pullId generation (sequential)
- supports labels via sh.tangled.label.op records
- stores patch in pull record for review