docs(workplans): write files for 4 pre-ADR-001 orphan workstreams

Resolves all orphan-workstream FAIL findings from validate_repo_adr.
The custodian domain now passes 47/47 checks (0 warn, 0 fail).

Files written:
  CUST-WP-0001  custodian-agent-runtime (2 tasks: 1 done, 1 todo)
  CUST-WP-0002  contribution-tracking-sbom (15 tasks, v0.5 scope
                reductions annotated inline)
  CUST-WP-0003  whi-kpi-card (9 tasks)
  CUST-WP-0004  ep-td-tracking (10 tasks: 4 done, 6 todo)

All files cross-reference state_hub_workstream_id and
state_hub_task_id for future sync reconciliation.

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

workplans/CUST-WP-0001-custodian-agent-runtime.md

@@ -0,0 +1,69 @@
+---
+id: CUST-WP-0001
+type: workplan
+title: "Custodian Agent Runtime — Bootstrap"
+domain: custodian
+status: active
+owner: custodian
+topic_slug: custodian
+state_hub_workstream_id: a2d9919d-62ec-49e7-9533-ba650757e70a
+created: "2026-02-25"
+updated: "2026-02-28"
+---
+
+# Custodian Agent Runtime — Bootstrap
+
+## Summary
+
+Design and bootstrap the Custodian as an acting agent: a standalone
+LLM-powered service that uses the State Hub as its coordination layer.
+Distinct from the State Hub tooling itself.
+
+## Context
+
+The State Hub provides the read model and MCP interface. The Agent Runtime
+is a separate concern: the loop, policy engine, and tool adapters that
+make the Custodian an autonomous (or semi-autonomous) participant rather
+than a passive data store.
+
+## Dependencies
+
+- Depends on: `markitect/llm-shared-library` (llm-connect) — must reach
+  stable installable state before implementation can begin.
+  Dependency resolved: llm-connect extracted and integrated (2026-02-27).
+- Depends on: `railiance/phase-0-operational-baseline` — agent runtime
+  deployment requires a stable, backed-up server environment.
+- state_hub_dep_ids:
+  - a46f5838-e489-434f-b7ee-996c2fdd81ad (llm-shared-library)
+  - 7f0d9856-9561-4404-96f0-91e8eb79feca (phase-0-operational-baseline)
+
+## Tasks
+
+### T1 — Bootstrap blocked: awaiting markitect/llm-shared-library
+
+```task
+id: CUST-WP-0001-T01
+state_hub_task_id: ac42e548-10bf-4851-94e2-c8d35876f2f9
+status: done
+priority: high
+```
+
+All implementation tasks for the agent runtime were blocked until
+llm-connect was extracted as a standalone installable package from
+markitect. Resolved 2026-02-27: llm-connect integrated in state-hub as
+editable dependency; markitect llm-check smoke test green.
+
+### T2 — Define agent architecture and capability scope
+
+```task
+id: CUST-WP-0001-T02
+state_hub_task_id: 9a9297cd-bd3c-409c-8384-6f06cfc6faa2
+status: todo
+priority: medium
+```
+
+Decide the Custodian agent's primary loop: what is the core OODA cycle?
+What tools does it need beyond the State Hub MCP? Where does it live —
+new repo or `runtime/` in the-custodian? Produce an architecture sketch
+covering: entry point, LLM integration (via llm-connect), tool manifest,
+state-hub interaction pattern, and deployment target.