WinRacing V63.0 — Race-Day Shadow Run Validator

Added:
1. analysis_chairman_v63_shadow_run.php
2. Chairman/api/api_shadow_run_v63.php
3. Chairman/audit/wr_chairman_shadow_run_validator_v63_0.php

Purpose:
- Replays the V62-certified pre-race payload in read-only shadow mode.
- Confirms deterministic serialization/fingerprint.
- Checks duplicate race/horse keys, score range, decision coverage and result isolation.
- Does not alter DB, schema, source decisions or live weights.

Test URLs:
http://localhost/winRacing/analysis_chairman_v63_shadow_run.php?race_date=2026-07-08
http://localhost/winRacing/Chairman/api/api_shadow_run_v63.php?action=latest&race_date=2026-07-08
