docs(adr): 0020 addenda — ratify JEF-263 TOFU baseline eviction + 24h established#138
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… established Records the two implementation decisions the durable per-repo signing baseline (#136) required: (1) eviction = per-pass full-state journal compaction + a bounded in-memory store that evicts non-established entries first; (2) `established` = 24h wall-clock age from first_seen, not a digest count an attacker could inflate. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VtjoJttCvBY4dzCoE4f9vP
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Ratifies and records the two ADR-0020 implementation addenda from #136 (JEF-263, durable per-repo TOFU signing baseline), which the engineer documented in-code and flagged for architect ratification during INTEGRATE.
DEFAULT_MAX_REPOS) that evicts non-establishedentries first. Full (not change-only) compaction is load-bearing — the negative-control test proves a write-once line ages out.established= 24h wall-clock age fromfirst_seen, not a digest/observation count an attacker could inflate by burst-pushing. Monotonic; needs no extra durable state.Also records the monitor-only follow-up: per-pass full compaction shares the single journal with breach/admission lines and raises their rotation pressure — bounded and acceptable now, revisit change-only/segmented journal at large scale.
Docs-only; no code change.
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https://claude.ai/code/session_01VtjoJttCvBY4dzCoE4f9vP