docs(prd): integrate the second brain as the fleet's knowledge layer

The PARA Obsidian vault (arcodange/SecondBrain — git-synced, sb.py
digest/inbox/gitea-ingest jobs on the hermes cron ticker, local Ornith
model, mcp-obsidian access) enters the PRD as a first-class component:
new T17 knowledge capture & retrieval fiche, knowledge-layer section in
the architecture (ERP = book of record, vault = context + institutional
memory, append-only idempotent deposits, trusted-but-stale retrieval),
hermes/Ornith recognized as the resident M4 runtime (D2 leaning, new D7
cluster<->vault access decision), foundation ledger row, diagram +
goals updated (mermaid revalidated, 231 links/anchors re-checked green).

Co-Authored-By: Claude Fable 5 <[email protected]>
This commit is contained in:
2026-07-11 14:35:22 +02:00
co-authored by Claude Fable 5
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commit 31158b05fa
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@@ -53,4 +53,4 @@ Per atom, mechanical, recorded in the registry ([ladder](README.md#the-autonomy-
## Evidence trail
Every month yields an audit pack: the coherence audit ([T15](task-inventory.md#t15--monthly-coherence-audit)), the month's run journals, snapshot content-hashes, approval-card decisions, and fiscal sheets — archived in git + GED. The pack is written for a third party (expert-comptable, auditor, or a future operator): it must let them reconstruct *what the fleet did and why* without access to this PRD or any chat history.
Every month yields an audit pack: the coherence audit ([T15](task-inventory.md#t15--monthly-coherence-audit)), the month's run journals, snapshot content-hashes, approval-card decisions, and fiscal sheets — archived in git + GED. The pack is written for a third party (expert-comptable, auditor, or a future operator): it must let them reconstruct *what the fleet did and why* without access to this PRD or any chat history. A distilled summary of each pack also lands in the second brain ([T17](task-inventory.md#t17--knowledge-capture--retrieval-second-brain)), so institutional memory outlives both chat logs and this repo.