config: remove the never-read PlatformConfig.pip_value (rule 8)

Every live reader of a pip value goes through PAIR_INFO[...]["pip_value"]
(signal_aggregator, gpu_backtest, diagnose_filters) or TradeSetup.pip_value;
no code read the PlatformConfig field. The three PlatformConfig(...)
constructions that passed it (gpu_backtest x2, diagnose_filters) and the
inline construction in the factory-equivalence test drop the kwarg. Neither
config fingerprint hashes the field, so logged fingerprints are unchanged.
The removed-field test now also asserts pip_value stays gone.

Parity: 12-month M5 and H1 books regenerated byte-identical
(md5 a28fed4becd056466c26d6a947e1a0e5 / d20405ef64f069770c258bb9bed1ac90).
Suite: 461 passed, 0 failed.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0156YhogLytzj9P2iH1skGbL

backtest/diagnose_filters.py

@@ -220,7 +220,6 @@ def run_diagnosis(
     platform_cfg = PlatformConfig(
         symbol=pair,
         display_name=display,
-        pip_value=pair_info["pip_value"],
         primary_timeframe=primary_tf,
         confirmation_timeframes=list(confirm_tfs),
     )

backtest/gpu_backtest.py

@@ -1763,7 +1763,6 @@ def run_backtest(
         platform_cfg = PlatformConfig(
             symbol=bt_cfg.pair,
             display_name=PAIR_INFO[bt_cfg.pair]["display"],
-            pip_value=PAIR_INFO[bt_cfg.pair]["pip_value"],
             primary_timeframe=bt_cfg.primary_tf,
             confirmation_timeframes=list(bt_cfg.confirmation_tfs),
         )
@@ -2402,7 +2401,6 @@ def main(argv: Optional[List[str]] = None) -> int:
         platform_cfg = PlatformConfig(
             symbol=pair,
             display_name=PAIR_INFO[pair]["display"],
-            pip_value=PAIR_INFO[pair]["pip_value"],
             primary_timeframe=primary_tf,
             confirmation_timeframes=confirm_tfs or [Timeframe.H1, Timeframe.H4],
         )