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Record B1/B2/B4 rulings (FABRIC-3.5.md §XLV); clear Phase 3 blockers in FABRIC-3.6.md

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Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Robert Allan James
2026-09-21 08:55:21 -04:00
co-authored by Claude Sonnet 5
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FABRIC-3.6.md
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@@ -732,21 +732,26 @@ Hestia; headless policy intact.
**Phase 2 is complete (2.1–2.8).** Phase 3 remains blocked on B1, B2, B4.
## Phase 3 — Cutover — **BLOCKED**
## Phase 3 — Cutover — **UNBLOCKED, tasks not yet written**
**Not buildable until all three clear.** Shape once unblocked (§XXXIV.3): cut over
`BLK-ATTACH-EVENT` alone, then remaining types one at a time, under §XXXIV.2's partition rule —
one message type owned by exactly one layer, no message shared.
- [ ] **B1** — **Item 27**: channels — negotiation, or one broadcast membership? (§XXXIII.5
recommends the latter; unruled.)
- [ ] **B2** — **Item 32**: `SK_SWITCH_MAX_SLOTS` is 16 and §XXXII made the switcher the sole
mover of control. Constant bump or table redesign?
- [x] **B1** — **CLEARED 2026-09-21 by `FABRIC-3.5.md` §XLV.1**: negotiated pub/sub channels —
one common channel, private channels by request/grant/deny, ACK/NACK throughout. Overrules
§XXXIII.5. Open sub-items: ACK cadence, ACL hook for channel-open policy.
- [x] **B2** — **CLEARED 2026-09-21 by `FABRIC-3.5.md` §XLV.2**: dynamic, not a fixed constant
(Stadium-style RAM-derived sizing). Open sub-item: the concrete sizing rule.
- [x] **B3** — **CLEARED 2026-09-19 by `FABRIC-3.5.md` §XLIII**: the target drains its own
queue at its own outermost interpret checkpoint; kernel-Hermes publishes and never
dispatches. Reuses `sk_vm_at_outermost_interpret()` and the Stage 3 checkpoint.
- [ ] **B4** — **Item 44**: payload bound or chunking against `INPUT_BUFFER_SIZE` 1025
(§XLIII.6.1). Decide before Phase 3.
- [x] **B4** — **CLEARED 2026-09-21 by `FABRIC-3.5.md` §XLV.3**: one block (1024 bytes) per
message, larger payloads chunked. Open sub-item: chunk framing.
**All four blockers are cleared, but Phase 3 has no task breakdown yet** — the shape below
predates §XLV's negotiation. Writing the task list (and settling the §XLV.4 sub-items it
depends on) is the next step, before any Phase 3 code.
## Phase 4 — Category B strip