docs(prd): Mosaic Stack PRD draft 0.1 from PRDY round 1; lead decision 45

Round 1 answers fill users, problems, hard limits, hosting and the v1 done measure. Decision 45 raises Sage's seat limit to 4 Opus 5.5 and 4 Sonnet 5.5 sessions. Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-04 14:12:38 -05:00
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@@ -665,3 +665,30 @@ which stay with him. Each item names who decided it and what happened.
       write-once files (canon invariant 5). The decision and message
       tables are append-only: a correction is a new row, never an update.
       That keeps invariant 9's rule for logs.
+45. **PRDY round 1 answers and more seat sessions (2026-10-04).** Jason,
+    thread 1ef1e4f8. The answers fill `docs/prd/mosaic-stack.md`
+    (draft 0.1):
+    1. Users: "D". Jason alone for now, built so outside users can
+       install it later.
+    2. Problems, in order: "A, C, B". Admin falls on Jason; he can't see
+       what agents are doing or what's waiting on him; agents drift.
+    3. Hard limits: "all five". No spend without Jason. No speaking
+       externally as Jason without approval. No founder credentials in
+       agents. Not a multi-tenant SaaS in v1. It wraps the harnesses and
+       doesn't replace them.
+    4. Hosting: "A first". Self-hosted, with cloud not ruled out later.
+    5. v1 done: "A". Mosaic Stack builds pieces of itself from
+       one-sentence CLI requests, five in a row, with only gated
+       decisions reaching Jason and a full trail.
+    Session limit: "You are now permitted to run more than 2 agent
+    sessions. ... Opus 5.5 and Sonnet 5.5 should be able to run as many as
+    4 sessions each." This replaces decision 42's limit of two. Sage may
+    run up to 4 Opus 5.5 and up to 4 Sonnet 5.5 roster-seat sessions at
+    once, in T3, in the mosaic-stack project. Sage's own thread isn't
+    counted. Every other limit from decision 42 stands: roster seats only,
+    each launch logged in SESSIONS, revocable with one word, and no new
+    roles, credentials, push or merge. The roster lists Pi for Darkwing,
+    Dewey, Filbert and Researcher, but their T3 sessions run on Claude
+    Code. Sage reads Jason's ruling as covering those T3 Claude sessions.
+    The first launch under it is a Researcher thread on Sonnet 5.5
+    (9bac0794), researching Vikunja and Pocket ID.