Implements forgejo-mcp-ya6 per docs/plans/issue-time-tracking.md.
Ten new MCP tools wrapping forgejo-sdk/v3 tracked-time and stopwatch APIs:
Tracked time:
- list_issue_tracked_times, list_repo_tracked_times, list_my_tracked_times
- add_issue_time (accepts either 'seconds' int or 'duration' string like "15m")
- reset_issue_time, delete_issue_time_entry
Stopwatches:
- start_issue_stopwatch, stop_issue_stopwatch, cancel_issue_stopwatch
- list_my_stopwatches
Forgejo shares index namespace between issues and PRs, so one tool set
covers both — tool descriptions state this explicitly.
- New operation/tracking/ package with unit tests using httptest mock
- pkg/to/Float64Ok helper to distinguish 'absent' from 'malformed' in
the add_issue_time seconds/duration validation
- README tool table updated
- Two Showboat demos: demos/issue-time-tracking.md, demos/issue-stopwatch.md
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