ah-xuc.1 Stage 2 foundation: domain buckets/outcome, ports contracts, config surface Past Stand

Every Stage 2 feature extends the shared contracts; land them first so later waves stay disjoint (SPEC section 13 isolation rule). No new external deps (crypto/hmac is stdlib, yaml.v3 already present) — go.mod stays untouched for the whole epic.

domain: OutcomeStalled ("stalled"); bucket-name constants for triage/blocked/question plus CanonicalBuckets() (States() plus the three — canonical buckets are a superset of states from now on); Run.Timeout time.Duration (0 = use config default).

ports: BoardTask.Labels []string (label titles); StartSpec.Skills []string (absolute skill dirs); Runner gains Publish(ctx, taskID) (PublishInfo, error) with PublishInfo{RemoteURL, Branch, WebURL} — zero-value info with nil error means publish not configured (skipped); error only on a real push failure. Document contracts in comments in the existing style.

config: vikunja.webhook_secret (optional); vikunja.web_url (optional, default = url with trailing /api/v1 stripped) for human task links; buckets now require all nine canonical keys (validate over domain.CanonicalBuckets()); skills_dir (optional path, tilde-expanded); task_types map[label-name]{role, model, skills, timeout — all optional} with validation (role exists, skill names are safe slugs — reuse validSlug, timeout parses positive, any skills referenced require skills_dir set); telegram optional block {token, chat_id, api_base default https://api.telegram.org} — token and chat_id required when the block is present; stall_timeout duration (default 10m, explicit "0" disables, otherwise at least 1m); repos[*].review_remote (optional git URL) and repos[*].review_url (optional template, must contain {branch} when set). Update config.example.yaml with commented examples of every new key.

go test ./internal/domain/... ./internal/config/... green; go vet clean on touched packages; table tests for nine-bucket validation, task_types, telegram block, stall_timeout, review_url template; config.example.yaml stays parseable; commits follow the area convention; only own packages staged

Coordinator refinements: (a) do NOT add a method to the ports.Runner interface — define a SEPARATE port Publisher { Publish(ctx, taskID) (PublishInfo, error) } plus the PublishInfo struct; the runner implements it in ah-xuc.5; this keeps every package (cmd, reconcile fakes) compiling between waves. (b) The nine-bucket requirement invalidates config fixtures outside internal/config: update cmd/agenthubd test fixtures AND the e2e harness fixtures (harness config + fake vikunja board columns Triage/Blocked/Question) in THIS bead — wave 1 runs solo so touching them is safe; goal: go test ./... and go test -tags e2e ./e2e/... stay green at every wave boundary. (c) vikunja.web_url default: vikunja.url with a trailing /api/v1 stripped. (d) stall_timeout: absent = 10m default; explicit "0" = disabled; the current parseDuration rejects nonpositive values, so handle the explicit zero separately. (e) review_url set without review_remote is a config error; review_remote alone is fine.