Repo hygiene: fill stack-and-commands, normalize workplan statuses

- Fill .claude/rules/stack-and-commands.md (was an empty TODO template)
- Normalize workplan frontmatter statuses to canonical vocabulary
  (completed/done -> finished) per ADR-001

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.claude/rules/stack-and-commands.md

@@ -1,19 +1,14 @@
 ## Stack
 
-<!-- TODO: Fill in language, frameworks, and key dependencies -->
-- **Language:**
-- **Key deps:**
+- **Language:** Python ≥3.12 (`railiance_fabric` package)
+- **Key deps:** jsonschema, PyYAML; SQLite registry at `.railiance-fabric/registry.sqlite3`
 
 ## Dev Commands
 
 ```bash
-# TODO: Fill in the standard commands for this repo
-
-# Install dependencies
-
-# Run tests
-
-# Lint / type check
-
-# Build / package (if applicable)
+python3 -m pytest tests/          # run the test suite
+make graph-explorer               # registry-backed graph explorer (HOST/PORT/REGISTRY_DB overridable)
+python3 -m railiance_fabric.server --db .railiance-fabric/registry.sqlite3
 ```
+
+Local-only tooling — no production deploy surface in this repo.