R2-B2 Technical Design Readiness — LEGO

Date: 2026-06-18 · Workstream: LEGO-PILOT-SLICE-0-R2-B2-PLANNING-BUNDLE-2026-06-18 (Deliverable B of five) · Editorial revision: rev1 Class: design-only / TD-readiness criteria / decision-support · READ-ONLY · NON-ENACTING · NON-AUTHORIZING · NOT remediation · NOT technical design · NOT implementation · NO blocker resolved · NO runtime touched.

Metadata convention. This body uses editorial revision (rev1) only. AgentData storage revision and content_length are authoritative in AgentData metadata at read time; they are deliberately not pinned in this body.

Readiness, not TD. This packet defines what must be true before actual B2 technical design can start. It is the readiness gate, not the TD. It writes no schema/DDL, table definition, migration plan, function body, SQL-mutate plan, producer/runner/scheduler implementation, command sequence, rollback script, or backlog-execution plan. If any such content appears, that is drift and must be rejected.

0. Status and non-authorization

STATUS: PASS — engineering / design-only. This is a complete readiness specification for actual B2 technical design: what must be frozen first, source-authority readiness, IO-contract readiness, bad-input runtime-test readiness, S7 evidence readiness, S8 rollback readiness, the channel-decision dependency, the staging/kho-tạm dependency, the Owner-gated future-work list, and explicit Go/No-Go criteria. It builds nothing, mutates nothing, authorizes nothing, and writes no technical design.

Engineering PASS ≠ authority PASS. A PASS here means the readiness gate is fully specified on paper — it does not mean readiness is met (it is not — multiple obligations are open), and it is not an Owner authorization to start B2 TD. Default disposition: HOLD.

Pipeline position (downstream-only).

… → R2-B2 Inspect Producer TD-prep (accepted, Codex PASS_WITH_CAVEATS) → this Pilot-Slice-0 planning bundle (Deliverables A–E) → (only if separately authorized, and only once these readiness criteria are met) actual B2 technical design → (only if separately authorized again) producer build / write-enabled remediation.

This packet sits between the accepted B2 TD-prep and any actual B2 TD. It is the explicit checklist an Owner uses to decide whether B2 TD may start; it opens no TD itself.

Non-authorization (explicit). This document does not, and cannot: run any DB write / DDL / DML; restart/reload any container/service; run any worker/cron/job; trigger DOT/KG/birth/certify/promote/repair execution; set inspect_*; set certified=true; flip any gate; assign a governance owner; install pg_cron; promote any agent-api contract; enable any worker; write env/config; patch source or any prior report; create a current corpus or staging corpus; write technical design; implement; resolve any blocker; declare readiness met; overwrite the v0.1-stable / FIX7 V3 baseline; promote or use Tool-Kiem-Thu v0.2-hardening as authority.

Evidence basis — INHERITED_EVIDENCE. No runtime was queried in this run; every runtime fact is inherited from accepted read-only reports. AgentData metadata authoritative at read time. CAV-3/CAV-4/CAV-5 carried.

Reading discipline (Codex caveat, honored). All sources read directly from AgentData KB, in bounded, sequential, single-document batch_read (full) calls, by the main process — no parallel reader-agents, no background reader-agents, no sub-agents, no local-prose inference.

1. Purpose

State the preconditions for actual B2 technical design so an Owner can decide whether to open it. The packet answers:

What must be frozen before B2 TD? — §4.
What source-authority gaps remain? — §5.
What staging surface must exist? — §11.
What IO contract must be immutable? — §6.
What bad-input cases must later become runtime tests? — §7.
What delete-fast proof must be required? — §9, §11 (and Deliverable D).
What rollback proof must be required? — §9.

The one rule, above all detail. B2 TD may start only when its contract is frozen, its rule-set source is authoritative (or its gap is explicitly Owner-accepted), its channel is decided (R2-D2), its producer owner is assigned (S2), and a disposable staging surface exists to develop/test it without touching production. Missing any of these → No-Go. Readiness is not met today.

2. Sources read

All sources read first-hand, directly from AgentData KB, via batch_read (single path, full: true), one document per call, sequentially, by the main process — no parallel/background reader-agents, no sub-agents, no local-prose inference. None SOURCE_NOT_READ. (Same 19-source set as Deliverable A §2; AgentData storage revision/content_length authoritative in metadata at read time.)

Cluster	Sources	Status	Used for
Accepted B2 chain	`r2-b2-inspect-producer-td-prep-lego-2026-06-18.md` + its execution report + its Codex review	READ (full)	the accepted B2 contract, §8 bad-input matrix, §10 S8 unit, §15 PO-1…9, B2-AC-1…14
Interface + block	`registries-pivot-lego-interface-td-prep-2026-06-18.md` (+ Codex); `r2-b-block-contract-packet-lego-2026-06-18.md` (+ Codex)	READ (full)	S3/S4/S7/S8 contracts; B3 stud; B4 consumer; B5/B7 boundaries
LEGO map	`r1-r2-modular-lego-architecture-scoping-2026-06-18.md` (+ Codex)	READ (full)	block map; anti-coupling; PO grounding
R2 root cause / readiness	`r2a-birth-inspection-runner-cron-log-root-cause-2026-06-18.md` (+ Codex); `r2-birth-certify-canonical-stamp-readiness-scope-2026-06-17.md`; `phase1b-runtime-truth-blocker-decision-packet-2026-06-17.md`	READ (full)	producer MISSING; `birth_registry` schema; no live `inspect_*` setter; blockers OPEN
Governance anchors	`architecture/birth-registry-law.md` (Đ0-G); `notes/dieu4-…`; `notes/dieu32-…`; `laws/dieu32-approval-law.md`; `notes/dieu35-…`; `ssot/operating-rules.md`	READ (full)	rule-set; birth≠canonical; Owner gate; DOT-100%; scanner=list-only; fail-closed/AP-CLOSE

3. Accepted B2 TD-prep baseline (carried, not re-derived)

Carried in substance from the accepted R2-B2 Inspect Producer TD-prep packet (Codex PASS_WITH_CAVEATS). This readiness packet does not change the contract; it specifies the gate to act on it.

B2 in one line: Inspect producer only — build-state MISSING (core R2 gap) — read uncertified birth_registry rows + the Điều 0-G rule-set, write inspect_pen/inspect_stamp/inspect_gate only (genuine per-stage, one-column-per-inspector, strict PEN→STAMP→GATE order, idempotent, fail→audit-queue), append S7, follow S8 as one producer run. Never certify, never canonicalize, never mint identity, never write KG provenance, never fake inspect_*=now(), never the 2026-03-21 fused INSERT, never net-new stamp columns.

The nine pre-implementation proof obligations (carried verbatim in substance, PO-1…PO-9, none satisfied): PO-1 Đ0-G rule-set recovered to an authoritative source; PO-2 channel chosen + liveness proven; PO-3 producer owner (S2) assigned; PO-4 per-run rollback unit + Đ39 pre-batch snapshot defined (incl. downstream-certify); PO-5 B3 inspect_* contract confirmed stable + B4 consumer re-verified; PO-6 fail-closed behavior runtime-verified once built; PO-7 B7 holds warn-mode until B2 stands up; PO-8 CONS-002/003 + CELL-003/004/007 + Đ0-G recovery confirmed as prerequisites to any canonical materialization B2's outputs feed; PO-9 B2 tested in isolation on a controlled fixture before any live run. This readiness packet maps each PO into a Go/No-Go criterion (§14).

4. What must be frozen before actual TD

These artifacts must be immutable inputs to B2 TD — frozen and accepted before TD starts. "Frozen" = agreed, versioned, and not subject to change mid-TD.

#	Must be frozen	Why	Frozen today?
F-1	The B2 13-field contract (responsibility, IO, authority, evidence, depends-on/must-not, replacement, failure mode, rollback, bad-input, rejection)	TD designs to the contract; a moving contract makes TD unverifiable	Yes (accepted in B2 TD-prep)
F-2	*The B3 `inspect_` data contract** (the load-bearing stud: column meaning + PEN→STAMP→GATE order + one-column-per-inspector)	The producer writes into this exact shape; B4 reads it independently	Yes (shape present; semantics carried) — see §6
F-3	The Điều 0-G PEN/STAMP/GATE rule-set (PEN=code/origin/species; STAMP=name/description/status; GATE=species-fit/business-rules; fail→audit-queue)	The meaning of "inspected"; TD must not invent it	Partial — read from a working source, not authoritative (§5)
F-4	The channel decision (R2-D2)	TD's invocation mechanics depend on the chosen channel; the contract stays channel-independent, but the build cannot start channel-undecided	No — compared (Deliverable A), not decided
F-5	The producer owner (S2)	Điều 32 §2.1 / §2.4: a new/fix DOT producer needs an assigned governance owner	No — `governance_object_ownership`=0 for the birth producer
F-6	The staging/kho-tạm surface (a disposable surface to develop/test B2 without touching production)	"nháp thoải mái" without production risk; PO-9 isolation testing	No — defined as an IO contract (Deliverable C), not built
F-7	The S7 evidence contract (what B2 appends; records-not-decides)	TD must emit the agreed evidence; S7 must not become a decision input	Yes (contract); writers are future-gated to build (§8)
F-8	The S8 per-run rollback unit (incl. the downstream-certify interaction)	TD must be rollbackable as one producer run	Partial — unit defined; mechanism + HOLD-2 OPEN (§9)

Readiness reading: F-1, F-2, F-7 are frozen; F-3, F-8 are partial; F-4, F-5, F-6 are open. Actual B2 TD is therefore No-Go today (§14).

5. Source-authority readiness

SOURCE_RECOVERY_REQUIRED — the Điều 0-G inspection rule-set. The PEN/STAMP/GATE check definitions B2 must run are read from architecture/birth-registry-law.md (Điều 0-G v1.0, S157, 2026-03-21) — a temporary working source. Its Constitution reference law-00g-birth.md is broken; Điều 0-G lives in architecture/, not in laws/, and is not embedded in the Constitution (confirmed by the Điều 4 compatibility note).

The readiness gap (PO-1). Until the Điều 0-G rule-set is recovered to an authoritative source (external S6, Owner-controlled, out-of-band) and the PEN/STAMP/GATE definitions are pinned, the rule-set B2 would encode is sourced from a working document, not the canonical law. TD may not silently treat the working source as authoritative.

The precedent gap (carried). Even the historical CLI producer (dot-inspect-pen) implemented PEN only; STAMP and GATE were "Phase B" and never built. So the STAMP and GATE inspection logic is the least-precedented part of B2 and the most design-open — its readiness depends most on PO-1.

CAV-2-style discipline. This asserts only that the Điều 0-G source is unreconciled in the inspected substrate, not that it is unrecoverable. Recovery is Owner-controlled and out-of-band.

Readiness verdict: source-authority is NOT ready (PO-1 open). TD that depends on STAMP/GATE definitions is blocked until Điều 0-G is recovered or the Owner explicitly accepts the working source as the TD basis with the caveat recorded.

6. B2 IO-contract readiness

The IO contract that must be immutable for TD (carried, design-only):

Input: uncertified birth_registry rows (certified=false); PEN scope further narrowed to governance_role='governed'; plus the Điều 0-G rule-set; plus the stage-ordering precondition (STAMP only where PEN present; GATE only where STAMP present). The live birth_registry columns the inspectors read are carried from the R2 readiness scope (entity_code, collection_name, species_code, dot_origin, governance_role, and the metadata fields name/description/status the STAMP stage checks).
Output: inspect_pen / inspect_stamp / inspect_gate only — each set only on a genuine per-stage pass, written to its own column, in PEN→STAMP→GATE order, idempotently (only an unset column is set).
Forbidden outputs: certified/certified_at; canonical_address/owner/jsonb_profile/status; entity_code/any identity field; KG provenance/edges; all three inspect_* at once without per-stage checks; net-new stamp columns.

Readiness criteria for the IO contract (PO-5):

B3 confirmed stable — the three inspect_* columns exist and their meaning/order is fixed (the load-bearing stud). Carried as present (R2 readiness §3 schema); a runtime re-confirmation of column types/shape is a Go criterion.
B4 consumer re-verified — trg_birth_auto_certify → fn_birth_auto_certify fires certified=true/certified_at only when all three inspect_* are present (atomic per row), and only reads inspect_* (it is the sole live function naming them). Carried as the live decoupling that lets B4 be "healthy but starved."
No contract drift — TD must not widen the output beyond the three columns, must not add a "complete" signal on a partial set, and must not change B3 except by a coordinated B2+B4 change.

Readiness verdict: IO contract is READY in shape (F-2 frozen), with a runtime re-confirmation of B3/B4 required as a Go criterion before TD (PO-5).

7. Bad-input runtime-test readiness

The §8 bad-input matrix (BI-1…BI-12, carried) is conceptual today and must become runtime tests once B2 is built. B2 is MISSING, so the matrix states expected fail-closed behavior; no runtime test is claimed (INHERITED_EVIDENCE / BAD_INPUT_BEHAVIOR_UNCLEAR). Readiness means: TD must commit to making each conceptual rejection a verified runtime behavior.

Bad-input class (carried)	Expected rejection (must become a runtime test)	Readiness note
Missing `entity_code` / `collection_name`	No `inspect_pen`; append failure to audit queue	PEN completeness; testable once built
Already `certified=true`	Skip / no producer write	scope/idempotency; testable
Partial `inspect_*` of unknown origin	Mark ambiguous / Owner-gated review / no certify	`BAD_INPUT_BEHAVIOR_UNCLEAR` — conceptual only
Điều 0-G rule-set unresolved	`SOURCE_RECOVERY_REQUIRED` / no stamp	depends on PO-1
Asked to set `certified=true` / `canonical_address`	Reject	B2-AC-1/AC-2
Blanket `inspect_*=now()`	Reject as the fused-shortcut pattern	B2-AC-5/AC-6
Out-of-order STAMP/GATE	Reject — later stamp may not be set while an earlier is NULL	B2-AC-13
Out-of-scope `governance_role` (`excluded`/`observed`)	Skip / out of scope	`BAD_INPUT_BEHAVIOR_UNCLEAR` for `observed`
Channel not approved / owner missing	No-op / pending Owner	depends on PO-2/PO-3
v0.2-hardening offered as FIX7 authority	Reject until Owner/User promotion	tool lock

Readiness criterion (PO-6). TD must include a runtime-verification plan that turns BI-1…BI-12 into executed tests: bad input does not stamp, does not certify, and appends to the audit queue. The detailed adversarial test plan is Deliverable D of this bundle; this section only records that fail-closed runtime verification is a TD precondition. No runtime test is run here.

Readiness verdict: bad-input runtime-test readiness is NOT met (the producer does not exist to test); the expected behaviors are fully specified and must become Go-gated runtime tests in TD.

8. S7 evidence readiness

The S7 evidence contract B2 must honor (carried, design-only): per-run counts (scanned / passed-PEN/STAMP/GATE / failed-per-stage / skipped); run identity (producer/runner id, channel id, rule-set version/hash, start/end timestamps); per-failure audit records (entity, stage, failed check) appended to the audit queue (entity_audit_queue / governance_audit_log / event_outbox); paths/hashes for reproducibility (AP-CLOSE).

Hard constraints (fail-closed): S7 records; it does not decide. A B2 evidence append must never act as an approval, certify signal, or gate-pass; B2 must not read S7 to make a decision; a "logging" write that mutates entity state is a category violation.

Readiness criteria.

The S7 writers are future-gated to build — the inspect-failure audit-queue emitter and quality-log emitter are not yet built (kg_quality_log=0; S7 build-state PARTIAL). TD must build the producer's evidence append path without making S7 a decision input.
Channel id in S7 — so a later channel swap is auditable (links to R2-D2).
Append-only, no-op-on-read — a missing evidence append degrades observability, never safety.

Readiness verdict: S7 contract is READY; the S7 writers are a future-gated build item TD must include (not done here).

9. S8 rollback readiness

B2's rollback unit = one producer run (a single bounded scan-and-stamp pass). Readiness means the rollback unit and its proof obligations are specified before TD; the rollback mechanism is FUTURE_TECHNICAL_DESIGN_REQUIRED (no script here).

Readiness criteria (PO-4).

Per-run rollback unit defined — one producer run is the unit at which B2 can be undone, deleted, and rebuilt (swap channel, keep contract). Carried as defined.
Điều 39 pre-batch snapshot discipline — a mandatory pre-batch snapshot before any ABox-style write pass; a candidate pattern to evaluate, not a script to copy.
fn_iu_enact reuse evaluated, not assumed — the atomic + fail-closed + post-write-verify pattern (IU lineage) is a reuse candidate; it is distinct from birth-certify and must not be assumed to cover it (HOLD-2).
Downstream-certify interaction accounted for — completing all three inspect_* triggers B4's independent auto-certify; the rollback-unit definition must account for whether/how to unwind a triggered certify (Owner-gated, FUTURE_TECHNICAL_DESIGN_REQUIRED).

Fail-closed S8 rule (readiness gate). If a clean per-run rollback unit cannot be defined for a candidate B2 design (including the downstream-certify interaction), that design is not authorized for write — fail closed. HOLD-2 is OPEN: there is no atomic end-to-end birth-certify promote transaction today.

Readiness verdict: S8 rollback readiness is PARTIAL — unit defined; mechanism + downstream-certify + HOLD-2 are open; rollback proof is a TD precondition.

10. Channel-decision dependency

B2 TD depends on R2-D2 (Deliverable A) being decided. The contract is channel-independent (B2-AC-7), but TD's invocation mechanics cannot be designed channel-undecided. Deliverable A compares and classifies the five channels (host cron / agent-api executor = candidates; pg_cron / job_queue = risky-future-gated; manual one-shot = rejected-as-standing) without selecting one.

Readiness criterion (PO-2). Before B2 TD: the Owner selects a channel from the candidates, and its liveness/observability is proven (host-cron entry in the snapshot, or agent-api contract bound + master-switch state, or — if chosen — pg_cron installed, or worker enabled + draining). Today: switches OFF, queue idle, no birth cron, pg_cron absent → channel liveness NOT proven.

Readiness verdict: NOT ready — channel undecided and substrate fail-closed.

11. Staging / kho-tạm dependency

B2 TD and the B2 build depend on a disposable staging/kho-tạm surface so the producer can be developed quickly, tested quickly, rejected quickly, and deleted quickly without ever touching canonical/production. This is the "nháp thoải mái" requirement and the PO-9 isolation-testing requirement.

Readiness criteria.

A staging IO contract exists — defined conceptually in Deliverable C of this bundle (input = a disposable projection of uncertified rows; output = candidate inspect_* results on a disposable surface, never production; forbidden = any production write / certify / canonical / identity / KG).
Candidate results are separated from production inspect_* — a B2 exercised in staging must never write production birth_registry.inspect_*.
Delete-fast proof — the staging surface + candidate outputs + staging evidence can be disposed in one unit, provably leaving production untouched (Deliverable D defines the proof).
Contract compatibility — staging uses the same B3 inspect_* shape and the same Điều 0-G fail-closed rules, so a producer validated in staging is contract-compatible when later (separately authorized) promoted.

Important boundary. The staging contract is IO-contract / boundary level only — no schema, no table, no SQL, no corpus, no live data extraction. Building staging is FUTURE_TECHNICAL_DESIGN_REQUIRED + Owner-gated (STAGING_TD_DRIFT guarded).

Readiness verdict: NOT met — the staging IO contract is defined (Deliverable C) but not built; B2 TD requires the staging surface to exist as a precondition.

12. Owner-gated future work

Every action below is forbidden now (OWNER_GATE_REQUIRED). Listing is scoping, not authorization.

Future work	Gate required	Forbidden now?
Open actual B2 technical design	Owner decision (after readiness met)	Yes
Recover the Điều 0-G inspection rule-set source (PO-1)	external S6 — Owner out-of-band	Yes
Select + wire the channel (PO-2 / R2-D2)	Owner decision + Điều 32 (+ infra/contract/worker gate per channel)	Yes
Assign the birth-producer governance owner (PO-3 / S2)	Điều 37 → Điều 32	Yes
Build the staging/kho-tạm surface	Điều 32 (staging build is future TD)	Yes
Build the S7 evidence/audit writers	Điều 32	Yes
Define/execute the per-run rollback mechanism (incl. downstream-certify)	Điều 32 + S8 within B2's package	Yes
Build / wire the standing B2 producer	Điều 32 + S2 + channel decision + staging	Yes
Run the one-time backlog pass (B5 — separate block, not B2)	Điều 32 + S5 + S6 + standing B2	Yes
Confirm transient `app.birth_gate_mode` (B7 — separate block; CAV-5)	Owner out-of-band — read-only	Yes (not done here)

13. What remains unresolved

Readiness is NOT met today. F-3/F-8 partial; F-4/F-5/F-6 open; PO-1…PO-9 all unsatisfied. Actual B2 TD is No-Go (§14).
SOURCE_RECOVERY_REQUIRED — Điều 0-G (PO-1): rule-set from a working source; Constitution ref broken; STAMP/GATE least-precedented.
CHANNEL undecided (PO-2 / R2-D2): substrate fail-closed (switches OFF, queue idle, no birth cron, pg_cron absent).
S2 owner unassigned (PO-3): governance_object_ownership=0 for the birth producer.
STAGING surface not built (PO-9 / Deliverable C): defined as IO contract only.
S8 mechanism + downstream-certify + HOLD-2 (PO-4): open; no atomic birth-certify promote transaction today.
BAD_INPUT_BEHAVIOR_UNCLEAR (PO-6): the §8 matrix is conceptual; runtime verification requires a built producer.
B7 holds warn-mode (PO-7): no warn→block flip before a producer exists; transient GUC out-of-band (CAV-5). B7 is a separate block, not opened here.
CONS-002/003 + CELL-003/004/007 + Đ0-G recovery (PO-8): prerequisites to any canonical materialization B2's outputs ultimately feed (B2 itself never canonicalizes).
Blockers — all OPEN, none resolved: CONS-002, CONS-003, CELL-003/004/007, HOLD-1, HOLD-2, RISK-BYPASS, GOV-016/017, GOV-REUSE-001, Điều 39 runtime-EMPTY, Điều 35 production-readiness FAIL.
FUTURE_TECHNICAL_DESIGN_REQUIRED (NOT written here): any schema/DDL, table/column definition, migration, function body, SQL-mutate plan, producer/runner/scheduler/cron implementation, command sequence, rollback script, backlog-execution plan, or staging schema.

14. Go / No-Go criteria for actual B2 TD

B2 TD may start only when ALL of the following are Go. Each maps to a proof obligation (PO) and/or freeze item (F). All are currently No-Go or Partial — so actual B2 TD is No-Go today.

#	Go/No-Go criterion	Maps to	Status today
G-1	The B2 13-field contract is frozen and accepted	F-1	Go
G-2	The B3 `inspect_*` stud is confirmed stable (runtime-reconfirmed types/order) and B4 consumer re-verified (fires only when all three present)	F-2 / PO-5	Partial (shape carried; runtime re-confirm pending)
G-3	The Điều 0-G rule-set is recovered to an authoritative source (or the working source is explicitly Owner-accepted with caveat)	F-3 / PO-1	No-Go
G-4	A channel is selected from the candidates and its liveness/observability proven	F-4 / PO-2 / R2-D2	No-Go
G-5	The birth-producer governance owner (S2) is assigned via Điều 37 → Điều 32	F-5 / PO-3	No-Go
G-6	A disposable staging/kho-tạm surface exists (per Deliverable C) for isolated development/testing	F-6 / PO-9	No-Go
G-7	The S7 evidence contract is honored and the evidence writers are scoped to build (records-not-decides)	F-7 / S7	Partial (contract ready; writers future-gated)
G-8	The per-run S8 rollback unit + Điều 39 pre-batch snapshot + downstream-certify handling are defined; HOLD-2 path acknowledged	F-8 / PO-4	Partial
G-9	The §8 bad-input matrix is committed to become runtime tests (per Deliverable D); fail-closed verification planned	PO-6	Partial (plan defined; not runnable until built)
G-10	B7 holds warn-mode (no premature warn→block flip); transient GUC confirmed out-of-band	PO-7 / CAV-5	Partial (warn-mode holds; GUC out-of-band)
G-11	CONS-002/003 + CELL-003/004/007 + Đ0-G recovery confirmed as prerequisites to any downstream canonical materialization	PO-8	No-Go (blockers OPEN)

Aggregate verdict: NO-GO. Readiness is fully specified (engineering PASS) but not met — five criteria are No-Go and five are Partial. Actual B2 TD must not start until the Owner converts the No-Go/Partial criteria to Go.

15. Ready for GPT/Codex review

Yes — as a design-only readiness specification, not a technical design.

Core rule, kept above all detail: B2 technical design may start only when the contract is frozen, the Điều 0-G source is authoritative (or its gap is Owner-accepted), the channel is decided (R2-D2), the producer owner (S2) is assigned, and a disposable staging surface exists — and even then only behind a separate Owner gate. This packet writes no TD; it defines the gate.

Default disposition: HOLD. Engineering PASS = a complete readiness gate on paper; readiness itself is NOT met (aggregate No-Go), and a PASS is not an Owner authorization to start B2 TD. No PASS authorizes writes. All blockers remain OPEN.