[apresmoi]

Adds an injectable epoch-millisecond clock so callers replaying a historical moment (training trials) can make Mneme observe task time instead of wall time.

• MemoryClock, createOffsetClock({ origin, anchorMs }) and resolveClock exported from the package root.
• Every data/visibility time read uses the clock: event createdAt, TTL expiry, causal recorded_at, authority expiry and consumed_at, MCP expiresAt, envelope nonce/expiry. Latency timing stays on real time.
• mneme mcp --clock-origin <ISO> --clock-anchor-ms <ms> (env MNEME_CLOCK_ORIGIN / MNEME_CLOCK_ANCHOR_MS): advancing clock origin + (realNow - anchor); invalid values refuse startup.
• One clock per composition: mixed custom clocks across supplied dependencies are refused; legacy clockless compositions are unchanged. Every sample is validated to stay within years 0000-9999.
• Generated nonces now carry a random component, so they stay unique under a frozen clock.

No clock configured means behavior identical to before. Mneme stays independent of other repos (no runtime-specific names).

Consumers: Daimon (feat/task-clock) feature-detects createOffsetClock; it needs a release of this change.