docs(prd): client dossiers — the junction of the three agent families

Operator insight 2026-07-11: the second brain's client dossiers
(01-Projects/Clients/<client>/) are where the back-office fleet meets
the sales chain and the future delivery agents working on client
projects. Knowledge-layer bullet: agent-owned deposit files (never
edits of human notes), each family feeds and reads the dossier
(billing state + contract facts in; dunning tone, contract scope,
new-business sightings out — the KM 4% settlement clause makes
delivery observations a billing input); vault routing doctrine
(local-first) for confidential client content. Backlog updated with
the 2026-07-11 CRM audit facts (propal/contrat/projet modules empty,
KM retainer terms only in WIP JSON — deferred schedule = T06's source
of truth) and the third family (delivery agents; Granola→vault ingest
as an sb.py job; REX → Mode B evidence → CMS).

Co-Authored-By: Claude Fable 5 <[email protected]>

vibe/PRD/ai-back-office/agent-architecture.md

@@ -176,6 +176,7 @@ The integration contract ([T17](task-inventory.md#t17--knowledge-capture--retrie
 - **Capture:** fleet outputs worth remembering land as **append-only inbox/area notes with idempotent frontmatter** — the pattern the Gitea ingest already proves; human-authored notes are never edited in place.
 - **Retrieval:** context-hungry atoms query the vault and carry facts *with their note dates* — notes are **trusted-but-stale**: anything contradicting the ERP, or older than its subject's last change, triggers re-verification rather than belief.
 - **Rails reused, not rebuilt:** M4-side access is direct filesystem + `mcp-obsidian`; the weekly digest and the human's PARA filing ritual remain the curation loop; cluster-side access is open decision [D7](#open-decisions).
+- **Client dossiers — the junction of the agent families.** `01-Projects/Clients/<client>/` is where this fleet meets the sales chain (prospection → proposal → contract) and the future **delivery agents** working on client projects (the KM architecture notes already live there). Deposits are **agent-owned files** (e.g. a regenerated billing-snapshot note with `ai_generated` frontmatter), never edits of human notes; each family both feeds and reads the dossier — the back-office deposits billing state and contract facts and retrieves dunning tone; delivery agents deposit decisions, meeting notes and **new-business sightings** (contract clauses like the KM 4 % settlement make this a billing input) and retrieve contract scope and billing state. Client-project content is confidential by default — the vault's own routing doctrine applies (Ornith/local first).
 
 ## Open decisions