Feature: Implement V0 Episodic Context Manager

- Re-wrote the monolithic string-based context manipulation logic into an elegant, immutable Episodic IR pipeline.
- Implemented four non-destructive degradation processors: `HistorySquashingProcessor`, `ToolMaskingProcessor`, `BlobDegradationProcessor`, and `SemanticCompressionProcessor`.
- Added dynamic configuration knobs (`budget` and `strategies`) to precisely tune the retention algorithms.
- Implemented a power-user `incrementalGc` flag for maximum context preservation beneath the ceiling.
- Enforced strict typing across the new pipeline, replacing unsafe casts with robust mapping interfaces.
- Added `powerUserProfile` to support features for those wanting a bit
  more quality at the cost of tokens.

docs/reference/configuration.md

@@ -1693,6 +1693,12 @@ their corresponding top-level category object in your `settings.json` file.
   - **Default:** `false`
   - **Requires restart:** Yes
 
+- **`experimental.powerUserProfile`** (boolean):
+  - **Description:** Enables continuous minimal GC near the max tokens limit
+    instead of a blocked backbuffer.
+  - **Default:** `false`
+  - **Requires restart:** Yes
+
 - **`experimental.generalistProfile`** (boolean):
   - **Description:** Suitable for general coding and software development tasks.
   - **Default:** `false`