feat: add source-backed retained-DOM Flocks adapter

[alowpoly]

Summary

• add a GPL-2.0-or-later, source-pinned port of Really Slick Screensavers Flocks
• prepare 216 seconds of the exact 4-leader/1000-follower source simulation into bounded retained-DOM desktop and mobile product banks
• render source-derived six-face triangular bipyramids through PolyCSS with stable roots, flat currentColor lighting, and no runtime geometry or source simulation
• follow Cyclone's prepared-loading contract: verify/decompress the active block plus eleven successors, materialize the active block plus two successors before clearing loading, and adopt bounded 960-state worker responses in main-thread idle slices
• add production shell, adapter-scoped deploy/cache integration, independent native state/geometry oracles, full frame-sequence comparison, startup/cadence tooling, and monorepo adapter auditing

Verification

• pnpm audit:adapters -- --slug flocks — 117/117
• pnpm verify:source-only --strict — pass
• pnpm test:flocks — 42/42
• pnpm prepare:flocks:check — deterministic 458-file tree, digest 758472b6a504df46ec59981e0590b046ec4fad6b54a89aab013d1229e6ce3a0d
• compiled native state oracle — 6,010 rows, 600 frames, zero failures
• fresh native/browser sequence on ac8c13e — 45 frames, 14,580 root transforms, zero transform/color mismatches, stable 324 roots/1,944 leaves, zero browser errors
• desktop cadence, three installed-Chrome runs — presented-frame p95 16.667-16.720 ms; worst DrawFrame 19.016-27.115 ms; zero app long tasks or block waits; 59.949-60.080 Hz publication
• Cyclone-standard startup horizon — 12 verified/decompressed blocks and three materialized blocks before readiness; 63 worker chunks adopted in 63 idle slices
• startup median — desktop 1,033.77 ms; mobile profile 599.80 ms
• maximum initial encoded transfer — desktop 601,215 B; mobile profile 305,342 B
• maximum resident prepared CSS strings — desktop 15,664,056 B; mobile profile 7,863,196 B
• 30-second desktop and mobile-profile playback — zero block waits, stale responses, materialization/playback long tasks, browser errors, or retained-DOM drift
• pnpm build:flocks:deploy && pnpm test:flocks:deploy && pnpm test:site — pass; cache-busted route ready in 986.1 ms with the complete startup horizon and zero request/page/debug errors

Product boundaries

• desktop product prefix: 324 of 1,004 source bugs
• mobile product prefix: 164 of 1,004 source bugs
• root color publication: 12 Hz staggered phases; transforms remain 60 Hz
• flat face lighting is a documented bounded deviation from source OpenGL lighting
• the 216-second exact-source bank closes through a documented prepare-only eight-second terminal bridge
• no landing-page project was added and nothing was deployed to production

Known limitation

A real USB-connected Chrome cadence trace was explicitly skipped and remains unproven. The mobile profile has correctness, startup, payload, residency, and desktop-Chrome evidence, but this PR does not claim physical-device performance qualification.

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