waybill 1.4.0

[1.4.0] - 2026-08-17

Added

• github-issues tracker adapter — GitHub Issues as the tracker of
  record: waybill sync-plan --tracker github-issues. Keys are GitHub's
  own cross-repo syntax (owner/repo#15), derived purely from the issue
  URL leaf; the conformance kit gained a matching derivation check (a
  composed key passes only when re-deriving it from the verbatim URL leaf
  reproduces it exactly) and adapters may now declare their tracker's own
  keyPattern — the metering branch pattern is deliberately untouched.
  Labels map to work_type, milestones to sprint, not_planned
  closures are dropped as cancelled work, PR rows from the REST /issues
  endpoint are skipped, and points stays null (GitHub has no estimates;
  a point scale is never invented). Both the gh CLI and REST payload
  shapes are accepted. Own-data scoping keeps unassigned issues and drops
  issues assigned only to someone else.
• Closing-keyword linkage — MergedChange gains closes:
  "Fixes #12" in a PR body, MR description, or commit body now pairs the
  change with its tracker item (GitHub's actual linkage mechanism —
  title/branch pattern matching alone was structurally blind to it).
  Keyword-per-reference grammar mirrors GitHub exactly; bare #15 expands
  against the change's own repo. git-local now captures commit bodies and
  treats a squash-merged commit carrying a closing ref as a merged change,
  so linear-history GitHub-flow repos get receipts too. The conformance
  kit verifies every closes ref against a closing keyword in the raw
  payload.