TLDR/Goal stores never evict; at 10,000 identities every new agent's tldr_update and goal_set fails #1277

TldrStore.ts: MAX_RECORDS = 10_000 and throw new Error('TLDR storage is full.') for a new identity; no record is ever deleted. Current rate ~27 new identities/day (347 TLDR / 307 Goal records since ~2026-09-12), so ~1 year to the wall, after which every new agent's TLDR and Goal writes fail for good (a fail-all, C5-shaped). Fix: evict least-recently-updated records past the cap (their history files are already capped separately). Severity P2 (latent, certain).

Found by the Stage 3 C6 hunt; lines are origin/main 9c6e48f. Findings file: temp/quality-loop/hunt-c6.md.

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