# SESSION HANDOVER - 2026-08-31 - P3-S25.1G BRIDGE VALIDATION

```text
DOCUMENT ROLE      : HANDOVER (SESSION CONTINUITY / RECOVERY CONTEXT ONLY)
AUTHORITATIVE SOURCE: canonical real checkpoint + bridge machine evidence
Session            : P3-S25.1G - CANONICAL PREFIX -> PARALLEL EXECUTION BRIDGE
Date               : 2026-08-31
Status             : CLOSED - evidence committed, classification A
AUTHORITY          : records what happened / what was verified / what remains; does NOT override canonical evidence and does NOT authorize CHUNK 12.
```

## Authoritative status block

```text
real checkpoint : UNCHANGED (sha256 76ce95eb1e67b4138302a9c9d318e3a3c9f3e52430ac80c08f1a9900da23d0c1)
run_id          : P3_S251_REAL_TICK_RUN_001 (untouched)
last chunk 11 | next chunk 12 | next byte offset 188743943
real bytes read : NEVER past byte 188743943 (no new real Tickstory bytes)
CHUNK 12        : NOT AUTHORIZED and NOT PROCESSED
SAFE_MAX_CHUNK_SIZE  : 25165824 bytes (24 MiB) - UNCHANGED
SAFE_CHUNKS_PER_TURN : NOT ESTABLISHED (UNCHANGED)
classification  : A - CANONICAL/PARALLEL COMPATIBILITY VERIFIED
```

## A. Session

Prove that the new parallel execution path can continue from the existing canonical real-data prefix (CHUNKS 0-11) without changing semantic meaning, state, boundary behavior, or final output. Disposable bridge ONLY; no real CHUNK 12.

## B. Workspace / repository

`D:\TradingTerminal\HFM Metatrader 5\MQL5\Shared Projects\SniperGold_ML_authoritative`

## C. Git

Starting sha : see bridge_manifest_before.json (git head_sha)

## D. Bridge results (machine evidence)

- canonical reproduces the committed prefix EXACTLY: PRIMARY rows 4,224,365 / M15 20,689 / M30 11,078; TAIL rows 1,689,622 / M15 7,401 / M30 3,997; final carries == checkpoint carries.
- parallel 2- and 8-worker outputs == canonical == committed oracle (invariance PASS).
- boundary 7/7 PASS (6 classes + CHUNK 10->11 at byte 163578081).
- continuation-state simulation (CHUNK 12 SIM): parallel accepts the canonical post-chunk-11 state without semantic translation loss; outputs and final states identical (PASS).
- interruption/resume: canonical + parallel worker-boundary resume with actual byte_end (PASS).
- mutation detection 8/8 (omitted range, duplicated range, wrong boundary, reordered result, wrong carry, altered prefix state, dropped rows, duplicated rows).
- reproducibility: canonical x2 and parallel x2 semantic equality (PASS).

Evidence: ml/p3/p3_s251_external_ingest/bridge_validation/output/bridge_*.json

## E. Scope protection

CHUNK 12 / later real chunks = NOT PROCESSED; new real Tickstory bytes = NONE read; Dukascopy = NOT accessed; ML = NOT run; production MQL5/MQH = UNCHANGED; SAFE_MAX_CHUNK_SIZE / SAFE_CHUNKS_PER_TURN = UNCHANGED; decision gate / state = UNCHANGED; historical evidence = UNCHANGED; real checkpoint byte-identical.

## F. Unresolved / next owner decision

* CHUNK 12 (byte offset 188,743,943) remains NOT AUTHORIZED; a new explicit owner authorization recorded in CURRENT_DECISION_GATE.md (or a new session prompt) is required before any real ingestion continues.
* The bridge proves the parallel engine is semantically compatible with the canonical prefix; it does NOT by itself authorize multi-chunk ingestion (SAFE_CHUNKS_PER_TURN unchanged).

*End of P3-S25.1G handover.*