feat(agent): deprecate and completely remove cline agent support

- Delete adapters/cline.py and unregister from registry.py
- Remove cline branches from lib.sh and all 8 skill scripts (create, resume, stop, status, reconcile, update_yaml_resumed, resolve_session_id, orc_onboard)
- Narrow own-key mapping dictionaries across lib_py core modules to 4 supported agents
- Delete cline-exclusive tests and retarget shared fixtures to grok/hermes/claude
- Update skills documentation and installation guides (439 passed, 0 failures)
- Archive cline deprecation consensus and review reports

.agents/skills/multi-agent-mux-orc-onboard/SKILL.md

@@ -8,7 +8,7 @@ platforms: [linux, macos]
 environments: [terminal, herdr]
 metadata:
   hermes:
-    tags: [agent, herdr, claude, antigravity, agy, cline, hermes, grok, orchestrator, onboard, isolation]
+    tags: [agent, herdr, claude, antigravity, agy, hermes, grok, orchestrator, onboard, isolation]
     related_skills: [multi-agent-mux-create, multi-agent-mux-resume, multi-agent-mux-monitor]
     prereq_skills: [multi-agent-mux-create]
 ---
@@ -24,7 +24,7 @@ Registers an orchestrator session UUID into the `orchestrator_uuids` list of `.m
 ```
 
 ### Options
-- `--uuid <uuid>`: Explicitly register the specified orchestrator session UUID (UUID format or cline ID format).
+- `--uuid <uuid>`: Explicitly register the specified orchestrator session UUID.
 - `--remove <uuid>`: Remove the specified UUID from the `orchestrator_uuids` list.
 - `--list`: Display all currently registered orchestrator UUIDs.
 - `--no-autodetect`: Disable process ancestry auto-detection when `--uuid` is not provided.
@@ -32,18 +32,16 @@ Registers an orchestrator session UUID into the `orchestrator_uuids` list of `.m
 
 ## Auto-Detection Hierarchy (Rev.2)
 
-When `--uuid` is omitted, `orc_onboard.sh` inspects the process ancestry tree of the nearest agent ancestor (`claude`, `agy`, `hermes`, `cline`, `grok`) in the following order:
+When `--uuid` is omitted, `orc_onboard.sh` inspects the process ancestry tree of the nearest agent ancestor (`claude`, `agy`, `hermes`, `grok`) in the following order:
 
 1. **CLI `argv`**:
    - `claude -r <uuid>` / `claude --session-id <uuid>`
    - `agy --conversation <uuid>`
-   - `cline --id <uuid>` / `cline --session-id <uuid>`
    - `grok --session-id <uuid>` / `grok --resume <uuid>`
 2. **Family-Matched Environment Variables**:
    - `claude` → `CLAUDE_CODE_SESSION_ID`
    - `agy` → `ANTIGRAVITY_CONVERSATION_ID`
    - `hermes` → `HERMES_SESSION_ID`
-   - `cline` → `CLINE_SESSION_ID`
    - `grok` → `GROK_SESSION_ID`
 3. **Fallback**:
    - If no valid ID matching the nearest agent family is found, exits with status 3 (`Could not detect orchestrator ID`).