Phase 14: dreaming as an opt-in, budgeted, non-acting idle mode

- dreaming.Service: deterministic memory replay sample keyed by dream id,
  vocabulary-based association of unlinked memory pairs (similar_to edges +
  dream_association events), speculative hypotheses as hypothesis-kind beliefs
  with two weak memory citations (starts ~0.30, asserted <= 0.35)
- Run marks the context forbidden for capabilities before anything else;
  test proves Invoke refuses inside a dream
- per-mind settings: enabled (default off), hours window (wraps midnight),
  interval, model-call / memory / hypothesis caps; global pause switch
- optional model wording via new `dream` prompt (role hypothesise)
- promotion adds operator evidence, rejection retracts the belief; both
  audited and recorded as operator actions
- migration 0014, API, Dreams tab and page, noemactl dreams, docs/dreaming.md

migrations/0014_dreams.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE IF EXISTS dream_hypotheses;
+DROP TABLE IF EXISTS dreams;

migrations/0014_dreams.up.sql

@@ -0,0 +1,36 @@
+-- Dreaming: replay, association and speculative hypotheses (spec §19).
+CREATE TABLE dreams (
+  id           uuid PRIMARY KEY,
+  mind_id      uuid NOT NULL REFERENCES minds(id),
+  status       text NOT NULL DEFAULT 'running' CHECK (status IN ('running','done','failed','rejected')),
+  trigger      text NOT NULL DEFAULT 'schedule',
+  started_at   timestamptz,
+  finished_at  timestamptz,
+  sampled      integer NOT NULL DEFAULT 0,
+  associations integer NOT NULL DEFAULT 0,
+  hypotheses   integer NOT NULL DEFAULT 0,
+  llm_calls    integer NOT NULL DEFAULT 0,
+  inputs       jsonb NOT NULL DEFAULT '[]'::jsonb,  -- sampled memory ids
+  error        text NOT NULL DEFAULT '',
+  created_by   text NOT NULL DEFAULT '',
+  created_at   timestamptz NOT NULL DEFAULT now()
+);
+CREATE INDEX dreams_mind_idx ON dreams (mind_id, created_at DESC);
+
+CREATE TABLE dream_hypotheses (
+  id           uuid PRIMARY KEY,
+  dream_id     uuid NOT NULL REFERENCES dreams(id),
+  mind_id      uuid NOT NULL REFERENCES minds(id),
+  belief_id    uuid NOT NULL,
+  memory_ids   uuid[] NOT NULL,
+  proposition  text NOT NULL,
+  confidence   double precision NOT NULL,
+  basis        text NOT NULL DEFAULT '',
+  wording      text NOT NULL DEFAULT 'deterministic',
+  status       text NOT NULL DEFAULT 'proposed' CHECK (status IN ('proposed','promoted','rejected')),
+  reviewed_by  text NOT NULL DEFAULT '',
+  review_note  text NOT NULL DEFAULT '',
+  reviewed_at  timestamptz,
+  created_at   timestamptz NOT NULL DEFAULT now()
+);
+CREATE INDEX dream_hypotheses_mind_idx ON dream_hypotheses (mind_id, status, created_at DESC);