ah-nyl.5 reconcile: the control loop Past Stand

Implement internal/reconcile per docs/SPEC.md SS10 (read SPEC fully; SS5, SS6, SS10, SS12 normative). The reconciler imports ONLY internal/domain, internal/ports, internal/config (+ stdlib). Sibling packages (store/vikunja/runner) may not compile yet — you must not import or build them.

Deliverables:
- New(deps Deps) *Reconciler where Deps{Store ports.Store; Board ports.Board; Runner ports.Runner; Notifier ports.Notifier; Cfg *config.Config; Log *slog.Logger; Now func() time.Time}.
- Run(ctx): loop — iterate every cfg.PollInterval, plus immediately when poked; Poke() (non-blocking, coalescing via 1-buffered channel); clean shutdown on ctx cancel.
- iterate(ctx) implementing SPEC SS10 verbatim: the bucket switch (ready claim/heal; in_progress adopt-or-fail/check; terminal buckets kill+align), vanish handling for store tasks missing from snapshot, claim ordering (persist BEFORE moving the card), check() with finalize on Completed, timeout kill (Now() - StartedAt > cfg.Timeout -> Kill + OutcomeTimeout), comments per the SS10 templates (claim comment with attach hint; success comment with DiffStat+Commits; failure comment with outcome + fenced tail of events — obtain the tail via Runner.Summary? No: events tail is runner-internal; include what RunStatus/Summary give you: outcome, exit code, diff stat if any, and reference to the worktree path + zellij attach hint. Keep comment builders as small pure funcs with tests).
- Prompt rendering per SPEC SS12: text/template over the role prompt file with {ID, Title, Description, Branch, RepoSlug}; render errors -> comment + move to failed (per SS12).
- Per-task action errors: log, append event where sensible, continue with other tasks; Snapshot error aborts the iteration (SS10).
- Every state-changing action appends a domain.Event via Store.AppendEvent.

Tests (the heart of this task — table-driven, in-memory fakes for all four ports, fake clock): claim happy path (verify order: CreateRun+UpsertTask precede MoveToBucket; comment posted), exit-0 finalize -> in_review + summary comment, exit!=0 -> failed + diagnostic comment, timeout -> Kill + failed(timeout), human drag to cancelled mid-run -> Kill + killed + aligned, crash-between-persist-and-move heal (rec in_progress + bucket ready -> just MoveToBucket), adopt (bucket in_progress, no rec, runner reports running), adopt-fail (no runtime -> failed + comment), vanish (in store, not on board -> kill + cancelled), poke triggers immediate iteration, ctx cancel stops Run. Fakes record calls for assertion; no real time.Sleep beyond trivial.

Constraints: work ONLY under internal/reconcile/. No go.mod changes, no .beads/. Build/test ONLY: go build ./internal/reconcile/... && go vet ./internal/reconcile/... && go test ./internal/reconcile/... . Commit 'reconcile: ...' staging only internal/reconcile. Do NOT push.