feat(CUST-WP-0001): implement Custodian Agent Runtime bootstrap

T2 complete: OODA loop skeleton with LLM integration, bounded actions,
and 32 offline unit tests.

Deliverables:
- runtime/agent.py     — CLI entry point (--domain/--all/--dry-run/--llm)
- runtime/context.py   — Observe: fetch_state + build_context
- runtime/actions.py   — Act: parse_plan + execute (3 sanctioned writes)
- runtime/README.md    — usage guide and architecture overview
- runtime/tests/       — 32 tests, fully offline
- runtime/pyproject.toml — standalone package with llm-connect dep
- canon/architecture/adr-002-custodian-agent-runtime-design.md

Key design decisions (ADR-002):
- Lives in runtime/ (not a new repo) — tight canon/state-hub coupling
- ClaudeCodeAdapter by default (local-first, no API key)
- Single-pass synchronous OODA for v0.1 simplicity
- Exactly 3 sanctioned write ops: add_progress_event, update_task_status, flag_for_human
- LLM returns JSON block in markdown for structured+auditable output

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

runtime/pyproject.toml

@@ -0,0 +1,19 @@
+[project]
+name = "custodian-agent-runtime"
+version = "0.1.0"
+description = "Custodian Agent Runtime — OODA loop bootstrap"
+requires-python = ">=3.11"
+dependencies = [
+    "httpx>=0.28.0",
+    "llm-connect",
+]
+
+[tool.uv.sources]
+llm-connect = { path = "/home/worsch/llm-connect" }
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+pythonpath = ["."]
+
+[dependency-groups]
+dev = ["pytest>=8.0"]