ServiceAuth token fixes:
- Reduce expiration from 600 to 60 seconds for method-less tokens
per AT Protocol spec (fixes BadExpiration error)

Spindle URL handling:
- Support URLs with or without protocol prefix (e.g., "spindle.vitorpy.com")
- Add protocol (https://) automatically in xrpc_url() when missing
- Extract host correctly for ServiceAuth audience DID in both cases
- Read spindle URL from repo's spindle field for secret operations
- Fall back to TANGLED_SPINDLE_BASE env var or default

Secret operations fixes:
- Add new post() method for endpoints that return empty responses
- Update add_repo_secret() and remove_repo_secret() to use post()
instead of post_json() (fixes JSON parsing error on empty response)
- All secret operations now connect to correct spindle instance

Other improvements:
- Add spindle field to RepoRecord struct
- Display spindle URL in repo info output
- Ensure all three secret operations (list, add, remove) use the
repo's configured spindle instance

- README.md: Complete rewrite with all implemented features
- Comprehensive command overview (auth, repo, issue, pr, knot, spindle)
- Installation instructions (source + AUR)
- Quick start guide with examples
- Configuration and environment variables
- Examples for issues, PRs, and CI/CD
- Development workflow section
- AGENTS.md: Updated from initial handoff to current status doc
- Implementation checklist (all features marked as complete except spindle run)
- Architecture patterns (ServiceAuth, repo creation, listing, PR merging)
- Working with tangled-core reference
- Next steps for contributors (focus on spindle run)
- Troubleshooting guide
- docs/getting-started.md: Expanded from stub to comprehensive tutorial
- Step-by-step installation guide
- First steps (auth, list, create, clone)
- Detailed examples for issues, PRs, and CI/CD
- Advanced topics (migration, output formats, quiet/verbose)
- Configuration and environment variables
- Troubleshooting section

Removed outdated "commands are stubs" messaging and added
accurate feature descriptions for all implemented functionality.

- Add spindle field to Repository struct
- Implement update_repo_spindle() to enable/disable CI for repos
- Implement list_pipelines() to fetch pipeline records from PDS
- Add Pipeline, TriggerMetadata, TriggerRepo, and Workflow structs
- Implement spindle config command:
- Enable/disable spindle for a repository
- Support custom spindle URL via --url flag
- Update repo record's spindle field
- Implement spindle list command:
- List all pipeline runs for a repository
- Display trigger kind, repo, and workflows
- Implement spindle logs command:
- Stream logs from a workflow execution via WebSocket
- Support both full job_id format (knot:rkey:name) and short format (name)
- Add --lines and --follow flags for log control
- Add WebSocket dependencies: tokio-tungstenite and futures-util
- Keep spindle run as stub (to be implemented later)

- Add merge_pull() to API client using sh.tangled.repo.merge
- Implement 'pr merge' CLI command with ServiceAuth flow
- Remove stub knot commands (list, add, verify, set-default, remove)
- Keep only 'knot migrate' which is fully implemented