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/cli/settings.md

@@ -165,6 +165,7 @@ they appear in the UI.
 | Model Steering                                       | `experimental.modelSteering`        | Enable model steering (user hints) to guide the model during tool execution.                                                                              | `false` |
 | Direct Web Fetch                                     | `experimental.directWebFetch`       | Enable web fetch behavior that bypasses LLM summarization.                                                                                                | `false` |
 | Memory Manager Agent                                 | `experimental.memoryManager`        | Replace the built-in save_memory tool with a memory manager subagent that supports adding, removing, de-duplicating, and organizing memories.             | `false` |
+| Use the power user profile for massive contexts.     | `experimental.powerUserProfile`     | Enables continuous minimal GC near the max tokens limit instead of a blocked backbuffer.                                                                  | `false` |
 | Use the generalist profile to manage agent contexts. | `experimental.generalistProfile`    | Suitable for general coding and software development tasks.                                                                                               | `false` |
 | Enable Context Management                            | `experimental.contextManagement`    | Enable logic for context management.                                                                                                                      | `false` |
 | Topic & Update Narration                             | `experimental.topicUpdateNarration` | Enable the experimental Topic & Update communication model for reduced chattiness and structured progress reporting.                                      | `false` |

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`