sprint-67(media-cycle): weekly digest + storyline threads engine

[KevinBigham]

Summary

• New packages/engine/src/media-cycle/ module — deterministic weekly power rankings (0.40·strength + 0.30·win_pct + 0.20·momentum + 0.10·sov), category-prioritized headlines, hot takes, and digest assembly
• New packages/engine/src/storyline-threads/ module — 5 archetypes (hot-seat-coach, qb-controversy, rookie-of-year-chase, records-chase, comeback-player) with pure seed / advance / close lifecycle
• Regular-season resolver (franchise-week.ts) archives digests + ranking snapshots and runs storyline order advance -> close -> seed
• Save bump 34 -> 35 with inline migration defaults for mediaCycle and storylineThreads + refreshed v34 fixture
• Legacy powerRankings contract preserved via thin adapter over media-cycle

Review gates (all green)

• pnpm -r typecheck — engine + web clean
• pnpm --filter @mfd/engine test — 1622 tests passing (+81)
• pnpm --filter @mfd/web test — 753 tests passing (unchanged)
• scripts/check-math-random.sh — no unauthorized Math.random()
• scripts/check-bundle-size.sh — engine chunk 253 KB (ceiling 312 KB)
• scripts/smoke-full-season.sh — 3-season integration + save round-trip pass
• Determinism skill — no new hazards introduced
• Save-migration skill — chain 1→34 continuous, v34→v35 well-formed

Contract notes for the web track

StorylineThread includes the heat: number and nextBeatHint: string | null fields the newsroom UI needs. Archetype keys are kebab-case (hot-seat-coach etc) and differ from the web track's temporary 8-archetype placeholder list — a follow-up web PR will swap the local apps/web/src/features/newsroom/types.ts for import type { StorylineThread } from '@mfd/engine' and adapt the display maps.

Test plan

• Full gate green locally (see above)
• CI green on push
• No new save-load regressions on existing fixtures

🤖 Generated with Claude Code

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[chatgpt-codex-connector]

Skip seeding new storylines after season flips to playoffs

This call seeds fresh threads even when the same tick has already switched nextState.phase to 'playoffs' (the regular-season branch sets that at franchise-week.ts:874-876 before this block runs), so week-18 processing can close existing threads and then immediately create new active ones in postseason context. Because storyline progression/closure is only executed inside if (completedRegularSeasonWeek), those newly seeded playoff threads will then sit active through playoffs/offseason and carry stale narratives into later weeks.

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