Checkpoint — FIX7 P0 Dry-Run + Execution-Readiness (2026-06-11)

• Final status: FIX7_P0_DRYRUN_AND_EXECUTION_REVIEW_PACKET_READY
• Owner decision consumed: AUTHORIZE_DRYRUN_ONLY
• Host: T1 / Claude Code / MYTHOS · Codex consulted: NO
• Production mutation: NO · Implementation execution: NO · REAL_RUN/QT001/cutover: NO

Under AUTHORIZE_DRYRUN_ONLY, T1 ran the FIX7 P0 staging/temp dry-run end to end and produced a review-ready packet. Four lanes closed together:

1. Dry-run staging lane — seal + planning verified byte-exact (N7 efb0c574…, N8 daa70c39…, P7 9ddb27c3…, seal tree 3890cd34…, planning tree f470d0d0…); DR-0..DR-5 executed in an isolated /tmp workspace; DR-1 reproduced the P7 canon pin 49c386a9… / 38756 bytes exactly.
2. Rollback proof lane — staging mutation occurred (DR-2/3/4) → rollback PROVEN_IN_STAGING (RB-2/3/4, before/after hashes; DR-3 restored to PIN/38756); production rollback correctly NOT_APPLICABLE (no production mutated).
3. TKT Base L0–L3 lane — L0 FILE / L1 RECONSTRUCTION / L2 FAIL-CLOSED / L3 GOVERNANCE all PASS; ceiling L3 honored (no L4/L5/L6 overclaim).
4. Execution-readiness review lane — verdict READY_FOR_OWNER_EXECUTION_REVIEW; owner next decision default HOLD, UNSIGNED.

Packet knowledge/dev/reports/architecture/fix7-p0-dryrun-and-execution-readiness-packet-2026-06-11/ (packet_tree 60fc0b724a8e9092f0e080f39760df0d7b292bc03b6dd298bded6de84ad77432); RERUN.sh → PASS; dryrun_validator.py exit 0; bad_input_probes.py 20/20 fail-closed, any_fail_open=false; KB round-trip byte-exact.

Objects TKT-OBJ-389..406 (PROPOSED, standalone addendum; collision scan 0 vs NVSZ 263..304 / authority 305..325 / TKT Base 326..342 / impl-planning 343..377 / T2 parallel-support 378..388 / canonical registry max 224). Deconflicted from an initial 378..395 draft after a concurrent T2 reservation of 378..388 was confirmed live. Canonical registry/00-index NOT folded in this macro.

Standing blockers (owner/operator only): FIX7-P0-PLAN-EXEC-AUTH-1 (OPT-4), -SURFACE-1/-2, -REALRUN-1, -SEPARATE-AUTH-1, FIX7-P0-DRYRUN-PROD-ROLLBACK-1.

Next: owner picks the post-dry-run decision (default HOLD). If AUTHORIZE_IMPLEMENTATION_EXECUTION_NO_PRODUCTION, route to a separately-authorized KB/governance execution macro after OPT-4 + production scoping. No production. No self-approval.