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.

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],
         )

config.py

@@ -332,7 +332,6 @@ class PlatformConfig:
 
     symbol: str = XAUUSD
     display_name: str = "XAU/USD"
-    pip_value: float = 0.10
 
     primary_timeframe: Timeframe = Timeframe.H1
     confirmation_timeframes: List[Timeframe] = field(

test_all.py

@@ -2072,7 +2072,6 @@ def _():
         inline_cfg = PlatformConfig(
             symbol=XAUUSD,
             display_name="XAU/USD",
-            pip_value=0.10,
             primary_timeframe=tf,
             confirmation_timeframes=ctfs,
         )
@@ -3259,10 +3258,12 @@ def _():
         assert deepseek_api_key(AppConfig()) == ""
 
 
-@test("config.py: hardcoded twelve_data_api_key field is gone")
+@test("config.py: removed PlatformConfig fields stay gone (twelve_data_api_key, pip_value)")
 def _():
     assert not hasattr(PlatformConfig(), "twelve_data_api_key"), \
         "credentials must not live in committed source"
+    # pip value comes from PAIR_INFO; the config field was never read (2026-09-06).
+    assert not hasattr(PlatformConfig(), "pip_value")
 
 
 @test("telegram_bot: credentials, quality, pairs, loops from app_config")