docs: create CHANGELOG.md with summary of 2025-12-19 changes

doc/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [2025-12-19]
+
+### Added
+- **Dynamic Edge Proximity**: Implemented `get_dynamic_edge_proximity` in `clp_hedger.py` and `clp_scalper_hedger.py`. This scales the edge protection buffer based on position size (Base 4% + 4% per $10k, capped at 15%) to better protect larger positions.
+- **Large Hedge Override**: Added logic to bypass trade cooldowns in `clp_hedger.py` when a rebalance requirement significantly exceeds the threshold (`LARGE_HEDGE_MULTIPLIER`).
+
+### Fixed
+- **Double Logging**: Resolved duplicate log entries in the terminal by setting `logger.propagate = False` in both `clp_hedger.py` and `clp_scalper_hedger.py` and cleaning up root logger handlers.
+- **Bug Fixes**: Fixed a `NameError` (undefined `dynamic_buffer`) and an `IndentationError` in `clp_hedger.py`.
+
+### Configuration Changes
+- **Weekend Strategy Update**:
+    - Updated `uniswap_manager.py`: Increased capital to $2,000 (`TARGET_INVESTMENT_VALUE_USDC`) and set a tighter range of +/- 1% (`RANGE_WIDTH_PCT = 0.01`).
+    - Updated `clp_hedger.py`: Lowered `MIN_THRESHOLD_ETH` to 0.008 for finer control and reduced `DYNAMIC_THRESHOLD_MULTIPLIER` to 1.2 for lower volatility environment.