docs: refactoring-backlog workspace — baseline + 3 Phase 1 agents

Runs the multi-agent refactoring-backlog pipeline in docs/project/
refactor-backlog-setup/ up to and including three of the seven Phase 1
agents.

00-baseline.md establishes the metrics every later agent must cite, using
only tooling already in the repo (vitest lcov, coverlet cobertura, ESLint's
core `complexity` rule at threshold 0 for a full distribution, depcruise
--metrics). Duplication and C# complexity had no tooling, so
tools/baseline-scan.mjs adds a deterministic ~200-line text scan rather
than a new dependency; the approximations are labelled as such.

Headline: FE 75.1% line coverage but only over the 98 of 220 source files a
spec loads; BE 97.6% line / 79.6% branch; 0 layering violations; 7.1%
duplication; 25 of 2085 TS functions over CC 10.

Then 02-testability, 04-cqrs-light and 06-adr-conformance (27 findings).
01/03/05 were skipped deliberately — the baseline shows little for them to
find; 07 (BIO2) and 08 (consolidation) are still open.

Each agent corrected a baseline observation of mine, and in every case the
error was in something derived rather than measured:

- BL-007 counted ~13 adapter "mutations" from the `runSubmit` helper name;
  5 of those call sites are reads. It also missed 3 real mutations that
  reach the raw ApiClient and never return a Result.
- BL-002 diagnosed the 100%-duplicated auth folders as ADR-0002's
  divergence prediction failing. It never had a chance to fail: §3's
  `Principal` union was never built.
- BL-004 named libs/shared/domain and libs/beheer/contracts as coverage
  gaps; both are pure type declarations where 0% is unimprovable.

All three corrections are recorded inline in 00-baseline.md §10, so agent
08 does not inherit the bad numbers.

.prettierignore excludes the agent prompt directories — reflowing their
markdown would edit the prompt text itself.

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

docs/project/refactor-backlog-setup/agents/00-baseline.prompt.md

@@ -0,0 +1,22 @@
+MODEL: Opus
+OUTPUT FILE: /refactor-backlog/00-baseline.md
+DEPENDS ON: none
+
+---
+
+[Insert contents of _persistence-protocol.md here]
+
+ROLE: Metrics Baseline Agent
+
+Before any refactoring suggestions, establish a baseline for the scoped codebase:
+- Test coverage (line/branch) per module, .NET and Angular separately.
+- Cyclomatic complexity per method/function (flag >10).
+- Duplication percentage (tool-based, e.g. jscpd/SonarQube if configured).
+- Dependency graph / layering violations (existing static analysis if present).
+- Count and location of existing CQRS-light and hexagonal architecture patterns
+  already in use (so later agents compare against actual current state, not
+  assumed absence).
+
+Output: a metrics table per module, plus a short list of modules ranked
+worst-to-best on each metric. This file is fixed input to every Phase 1 agent —
+no agent may propose a change without citing which baseline metric it improves.