feat(domain): pure business logic for parsing, identity, slots, acquisition, paths, organize, download state (W1-2)

- release-parser: title/file/dir parsing with MP parity + deviations (airDate/issue,
  cut, release group suffix fallback, dir+file merge, safe episode offset)
- identity: title normalization (NFKC, trad->simp map, season suffix) and
  evidence-level candidate ranking (year tolerance ±1, no probabilities)
- slot: hard/soft/upgrade evaluation (missing vs unmet fields), state machine,
  movie/unit completion (season pack must be covered by actual file list)
- acquisition: new_title/catch_up/upgrade modes, priority order, budget,
  cache volume hard threshold with resume watermark (no double counting)
- path: immutable path bindings, restricted naming templates, sanitize,
  conflict detection, downloader<->host path mapping
- organize: planOrganize with sidecar pairing, sample exclusion, existing
  target policy, crossDevice marking, H&R -> conflict for move
- download-state: qB state mapping, completion, no-progress evidence

230 tests, ~97% statement coverage.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

packages/domain/src/slot/index.ts

@@ -0,0 +1,28 @@
+export {
+  checkDistinctAssets,
+  type MovieAssetFact,
+  movieCompletion,
+  type UnitAssetFact,
+  type UnitCompletion,
+  unitCompletion,
+} from "./completion";
+export {
+  checkHardConditions,
+  compareRank,
+  DEFAULT_SOURCE_TIERS,
+  evaluateCandidate,
+  qualityTier,
+  type RankedEvaluation,
+  RESOLUTION_RANK,
+  rankForSlot,
+  softRank,
+} from "./evaluate";
+export {
+  canTransition,
+  type SlotEvent,
+  type SlotState,
+  type SlotStatus,
+  SlotTransitionError,
+  transition,
+} from "./state";
+export * from "./types";