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

docs/indicators.md

@@ -431,7 +431,7 @@ Periodic pattern detection and dominant frequency extraction. Markets exhibit cy
 | [**CCYC**](../lib/cycles/ccyc/Ccyc.md) | Ehlers Cyber Cycle | 4-tap FIR + 2-pole high-pass IIR cycle extraction |
 | [**CG**](../lib/cycles/cg/Cg.md) | Ehlers Center of Gravity | Ehlers cycle measurement |
 | [**DSP**](../lib/cycles/dsp/Dsp.md) | Ehlers Detrended Synthetic Price | Cycle-isolated price component |
-| [**EACP**](../lib/cycles/eacp/Eacp.md) | Ehlers Autocorrelation Periodogram | Ehlers dominant cycle detection |
+| [**ACP**](../lib/cycles/acp/Acp.md) | Ehlers Autocorrelation Periodogram | Ehlers dominant cycle detection |
 | [**EBSW**](../lib/cycles/ebsw/Ebsw.md) | Ehlers Even Better Sinewave | Ehlers improved cycle indicator |
 | [**HOMOD**](../lib/cycles/homod/Homod.md) | Ehlers Homodyne Discriminator | Dominant cycle period tracking |
 | [**HT_DCPERIOD**](../lib/cycles/ht_dcperiod/HtDcperiod.md) | Ehlers HT Dominant Cycle Period | Hilbert Transform period estimation |

docs/pinescript.md

@@ -419,7 +419,7 @@ Markets oscillate. These indicators try to measure the oscillation itself — th
 | CCYC | Ehlers Cyber Cycle | [ccyc.pine](../lib/cycles/ccyc/ccyc.pine) |
 | CG | Ehlers Center of Gravity | [cg.pine](../lib/cycles/cg/cg.pine) |
 | DSP | Ehlers Detrended Synthetic Price | [dsp.pine](../lib/cycles/dsp/dsp.pine) |
-| EACP | Ehlers Autocorrelation Periodogram | [eacp.pine](../lib/cycles/eacp/eacp.pine) |
+| ACP | Ehlers Autocorrelation Periodogram | [acp.pine](../lib/cycles/acp/acp.pine) |
 | EBSW | Ehlers Even Better Sinewave | [ebsw.pine](../lib/cycles/ebsw/ebsw.pine) |
 | HOMOD | Ehlers Homodyne Discriminator | [homod.pine](../lib/cycles/homod/homod.pine) |
 | HT_DCPERIOD | Ehlers Hilbert Transform Dominant Cycle Period | [ht_dcperiod.pine](../lib/cycles/ht_dcperiod/ht_dcperiod.pine) |

docs/validation.md

@@ -145,7 +145,7 @@ Next parity targets (highest impact):
 | **Dynamic Momentum Index** | [Dymi](../lib/oscillators/dymi/Dymi.md) | - | - | - | [⚠️](../lib/oscillators/dymi/Dymi.md#validation "structural test only; Ooples uses different dynamic period logic") | - |
 | **Ease of Movement** | [Eom](../lib/volume/eom/Eom.md) | - | [✔️](../lib/volume/eom/Eom.md#validation) | - | - | ⚠️ |
 | **Efficiency Ratio** | [Er](../lib/oscillators/er/Er.md) | - | - | - | - | ⚠️ |
-| **Ehlers Autocorrelation Periodogram** | [Eacp](../lib/cycles/eacp/eacp.md) | - | - | - | - | - |
+| **Ehlers Autocorrelation Periodogram** | [Acp](../lib/cycles/acp/acp.md) | - | - | - | - | - |
 | **BandPass Filter** | [Bpf](../lib/filters/bpf/Bpf.md) | - | - | - | - | - |
 | **Ehlers Center of Gravity** | [Cg](../lib/cycles/cg/Cg.md) | - | - | - | [⚠️](../lib/cycles/cg/Cg.md#validation "structural test only; Ooples CG uses different weighting scheme") | ⚠️ |
 | **Ehlers Correlation Cycle** | [Ccor](../lib/cycles/ccor/Ccor.md) | - | - | - | - | - |