docs(fleet): refine Mosaic Platform PRD per Jason's review (R1–R7)

Post-review refinements to the DRAFT PRD set (decisions D1–D12 unchanged):

- R1: PRD-permission-relay is now self-contained — its cited design source
  (guard-rails-capability-permissions.md) is absent from origin/main, so the
  essential model (prepare-freely/execute-with-approval, permission levels,
  resource:action grants) is folded in as the authoritative spec.
- R2: Phase-1 conversation channel is tmux/CLI via the f4 Phase-1 tmux
  connector (operator issues /remote-control); Matrix room (J5/K1) is Phase 2.
- R3: Jarvis is a Level-0 orchestrator (delegation + subagents, never executes
  coding/infra); AC-NS-8 latency isolation is a separate-model-capacity
  guarantee, not just a separate process (NS-10, AC-NS-8, ASM-5).
- R4: jarvis-brain reframed as the P0 (prototype) Mosaic Stack; tenant-1
  migration targets the proper stack storage layer (vector DB + enhanced
  memory + flat-file backends). Agent memory/runbooks migrate live into the
  memory subsystem and are NOT frozen; repo retires read-only only after both
  PA data and agent memory are verified migrated (X2/X-R7).
- R5: homelab→USC promotion is an explicit owner sign-off gate, not an
  automated metric (X deployment-scope).
- R6: verified K1 is covered by f4-matrix-connector.md Phase 2 (no new doc).
- R7: clarified always-available Opus ≠ standing cost (idle = no bill) (J-R2).
- Also normalized PRD-backlog-providers.md and PRD-webui-fleet-control.md with
  prettier (whitespace-only) — they were non-conformant as originally pushed
  and would have re-broken repo-wide format:check on merge.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RMoEx7hfdFGjUiCHuN1RRi

docs/fleet/proposals/mosaic-platform-prd/north-star-additions.yaml

@@ -11,8 +11,12 @@ standing_objectives:
       alias "Jarvis", unit mosaic-agent@main) that owns all human conversation
       and user-level personal-assistant work (ideas, schedule, email, tasks,
       knowledge) and delegates engineering/research/ops missions to the
-      orchestrator as Mosaic Backlog cards; the main agent never executes fleet
-      work itself and never interrupts the orchestrator for status.
+      orchestrator as Mosaic Backlog cards. It is a Level-0 orchestrator:
+      it accomplishes work through delegation and subagents, never by executing
+      coding/infra tasks itself, and it runs on model capacity separate from the
+      orchestrator so its conversational latency is isolated from fleet load. The
+      main agent never executes fleet work itself and never interrupts the
+      orchestrator for status.
   - id: NS-11
     text: >-
       Irreversible or externally-visible agent actions pass a human-in-the-loop
@@ -32,9 +36,10 @@ standing_objectives:
 success_criteria:
   - id: AC-NS-8
     text: >-
-      A user converses with the main agent in its Matrix room while the
-      orchestrator is under full load; main-agent response latency is unaffected
-      and the orchestrator receives zero conversational traffic.
+      A user converses with the main agent in its channel while the
+      orchestrator is under full load; because the main agent runs on separate
+      model capacity, its response latency is unaffected and the orchestrator
+      receives zero conversational traffic.
   - id: AC-NS-9
     text: >-
       A mission agreed in the main-agent conversation appears as a backlog card
@@ -162,8 +167,10 @@ goals:
     phase: 3
     priority: must-have
     depends_on: [K1, P2, Q1]
+    # jarvis-brain is the P0 (prototype) Mosaic Stack; migration targets the proper
+    # stack storage layer (vector DB + enhanced memory + flat-file backends).
   - id: X2
-    title: Tenant-1 migration — jarvis-brain flat files (projects, tasks, events, tickets, knowledge) into the Jason workspace; brain.py retires
+    title: 'Tenant-1 migration — P0 (jarvis-brain) into the proper Mosaic Stack: (a) PA data (projects/tasks/events/tickets/knowledge) into the Jason workspace, (b) agent memory/runbooks into the enhanced memory subsystem (kept live, not frozen); jarvis-brain retires read-only only after both are verified'
     phase: 3
     priority: must-have
     depends_on: [J2]
@@ -179,7 +186,9 @@ assumptions:
     text: >-
       The main agent initially runs on the homelab fleet host alongside the
       orchestrator under mosaic-agent@main.service; host placement is a config
-      field, not a code assumption.
+      field, not a code assumption. Host co-location does NOT imply shared
+      inference: Jarvis (Opus) and Mos (Fable) hold separate model capacity/quota
+      so orchestrator load cannot degrade conversational latency (AC-NS-8).
   - id: ASM-6
     vetoable: true
     text: >-