feat(agent): add Grok Build TUI adapter, runtime dispatch, and skill support

.agents/reports/reviewer-cline-01/report-6be7c4c2.md

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+# Review Report — Job 6be7c4c2
+
+- **Reviewer**: reviewer-cline-01
+- **Job ID**: 6be7c4c2
+- **Role**: Reviewer
+- **Target**: Grok Build TUI Agent (`grok`) Integration
+
+## 1. Code Review Findings
+
+### 1.1 Core Adapter Implementation
+- `GrokAgentAdapter` in `lib_py/agents/adapters/grok.py` cleanly implements `BaseAgentAdapter` interface:
+  - `name = 'grok'`
+  - `own_key = 'grok_session_id_own'`
+  - `ready_tokens = r'Grok|xAI|Assistant|❯|>>>'`
+  - `exit_key = '/exit'`
+  - `delegate_agent_key = 'grok-cli'`
+  - Correct spawn spec, resume spec, and session artifact paths.
+- `registry.py` correctly registers the adapter.
+
+### 1.2 Shell Scripts & Skills Updates
+- `lib.sh`, `create_session.sh`, `resume_session.sh`, `stop_session.sh`, `reconcile.sh`, and `orc_onboard.sh` all properly integrate `grok`.
+- All 8 `SKILL.md` files updated with `grok` support and documentation.
+- `.mam.env.example` updated with default configuration.
+
+### 1.3 Advisory Findings (Non-blocking)
+- `status.sh` line 56/61 `resume_on_disk()` agent detection loop can be extended with `'grok'` for richer status reporting in future iterations; current fallthrough safely returns '?' without impacting core lifecycle.
+
+### 1.4 Test Verification
+- `test_a4_adapter_contract.py` (all 8 adapters verified), `test_tier1_unit.py`, and `test_b19_headless_reconcile_fixes.py` all PASS (80/80 tests green).
+
+[VERDICT: PASS]