Rename EACP to ACP across entire codebase

- Renamed directory lib/cycles/eacp → lib/cycles/acp
- Renamed class Eacp → Acp, EacpIndicator → AcpIndicator
- Renamed all files: Eacp.cs → Acp.cs, Eacp.Quantower.cs → Acp.Quantower.cs,
  eacp.md → acp.md, eacp.pine → acp.pine, and all test files
- Updated display names: EACP → ACP in Quantower Name/ShortName properties
- Updated all documentation surfaces: _sidebar.md, lib/_index.md,
  lib/cycles/_index.md, docs/indicators.md, docs/validation.md,
  docs/pinescript.md, lib/cycles/cg/cg.md cross-reference
- Updated Python bridge: qtl_eacp → qtl_acp entry point, _bridge.py,
  cycles.py wrapper, SPEC.md, test_shapes.py, run_all_exported
- All 83 tests pass (38 AcpTests + 22 AcpValidationTests + 23 AcpIndicatorTests)
- Build: 0 warnings, 0 errors across all projects

python/tests/run_all_exported_pandasta_validation.py

@@ -103,7 +103,7 @@ NO_PTA_EQUIVALENT: set[str] = {
     "bwma", "ccor", "ccv", "ccyc", "cfitz", "change", "cheby1", "cheby2",
     "cointegration", "conv", "coral", "correl", "covariance", "crma",
     "cv", "cvi", "cwt", "deco", "decycler", "dem", "dema_alpha", "dosc",
-    "dsma", "dsp", "dwma", "dwt", "dymi", "eacp", "edcf", "elliptic",
+    "dsma", "dsp", "dwma", "dwt", "dymi", "acp", "edcf", "elliptic",
     "ema_alpha", "etherm", "evwma", "ewma", "expdist", "exptrans",
     "fisher04", "gdema", "hanma", "hema", "kri", "lema", "lsma", "mae",
     "mape", "mse", "parzen", "pvd", "rain", "rmse", "sgma", "sinema",