- Added orchestrate keyword detection and notice handling for non-synthetic prompts.
- Added orchestrate notice handling in session output paths, including streaming and append delivery.
- Added a system orchestrate notice specifying task-subagent delegation, phase workflow, and validation gates.
- Added shared gradient-highlighter utilities and switched ultrathink highlighting to use cached palettes.
- Removed embedded orchestrate prompt artifacts and updated usage tips for orchestration, ultrathink, and /login behavior.
- Added a new ultrathink mode module with standalone, case-insensitive detection, rainbow editor highlighting, and a hidden notice payload.
- Updated `CustomEditor` and the shared TUI `Editor` to support optional zero-width text decoration and apply the `ultrathink` styling during input rendering.
- Extended `AgentSession` prompt handling to append the hidden ultrathink notice after user turns in both streaming and non-streaming message flows, excluding synthetic messages.
- Added session-draft persistence methods in SessionManager to write unsent editor text to an artifacts-sidecar draft file and delete it after single-shot consumption.
- Persisted editor text during interactive shutdown and restored that draft on resume when the editor was empty, enabling Ctrl+D draft recovery.
- Updated Ctrl+D handling in the editor/controller path and added tests covering draft round-trip, artifact cleanup, stale-draft eviction, and in-memory no-op behavior.
- Added abort signal support to LSP file operations (ensureFileOpen, refreshFile) enabling cancellation of long-running file operations.
- Added abort signal propagation through LSP request handlers (definition, references, hover, symbols, rename) with $/cancelRequest notification support.
- Added shouldBypassAutocompleteOnEscape callback to custom editor allowing parent components to override escape key handling behavior.
- Changed escape key handling in custom editor to respect bypass callback, enabling global escape handling during active operations.
- Fixed LSP operations to properly handle abort signals and throw ToolAbortError when operations are cancelled, with input controller bypassing autocomplete during streaming/loading states.
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