WP-0001-T008: operator docs + ADR cross-linking; mark WP-0001 done

docs/OPERATOR.md (new): runbook with prerequisites, quick start,
environment variables, SQLite + PostgreSQL setup, storage layout,
CLI reference, HTTP /health reference, an end-to-end Python smoke
test (create_package -> ingest_file -> finalize -> manifest), the
replay / disaster-recovery procedure, common failure modes, and a
References section that links every ADR (0001..0006), the
blueprint, platform ambition, roadmap, and assembly experiment.

README.md: refreshed to v0.1 baseline status. Quick-start uses the
real flow (uv sync, migrate-fresh, dev, /health, artifactstore health).
Make targets and CLI commands tabulated. Links docs/OPERATOR.md.

AGENTS.md: Current Repo Shape now reflects the landed scaffold +
library + CLI + HTTP app rather than "no runnable scaffold yet";
links OPERATOR.md and lists the canonical local commands.

workplans/ARTIFACT-STORE-WP-0001-service-baseline.md:
- T008 marked done.
- frontmatter status: active -> done; updated: 2026-05-16.

All ten WP-0001 tasks are now done (T001/T002/T003/T008/T009/T010/
T011/T012/T013/T014). Foundation workplan retires.

Gates: ruff clean, mypy --strict clean, 83 tests pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

workplans/ARTIFACT-STORE-WP-0001-service-baseline.md

@@ -4,13 +4,13 @@ type: workplan
 title: "Foundation: Scaffold, Core Kernels, Local FS Backend"
 repo: artifact-store
 domain: stack
-status: active
+status: done
 owner: codex
 topic_slug: stack
 planning_priority: high
 planning_order: 1
 created: "2026-05-15"
-updated: "2026-05-15"
+updated: "2026-05-16"
 state_hub_workstream_id: "aebf996c-8721-4e8c-9e56-61d5e4bf8dcb"
 ---
 
@@ -280,7 +280,7 @@ Acceptance:
 
 ```task
 id: ARTIFACT-STORE-WP-0001-T008
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "9b60036c-61f2-4c22-ad31-7213473d42d0"
 ```