chore(test + audit): add test-coverage audit + wire audit:all

#6 test coverage (pivot to reporting): 34/653 tests currently fail
(in-flight spaces-foundation migrations). Hard coverage thresholds
aren't enforceable until the suite is green, so this session ships a
file-presence audit instead of line-coverage gates.

  - scripts/audit-test-coverage.mjs — counts .svelte + .ts source files
    vs .test.ts + .spec.ts per module. Reports total ratio, lists
    modules with 0 tests + ≥3 source files (prioritised by size).
  - pnpm run audit:test-coverage  wires it into audit:*.
  - docs/optimizable/test-health.md — state + prevention path + top
    untested modules ranked by impact.

Current baseline: 2.6% file-level coverage. 66/78 modules have zero
tests. Biggest untested: times (32 src), articles (29), events (27),
inventory + skilltree (20 each).

#8 audit:all: single entry point for the reporting audits. Runs
port-drift + i18n-coverage + test-coverage in --summary mode. Distinct
from validate:all (which is gates, not reports).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/audit-test-coverage.mjs

@@ -0,0 +1,131 @@
+#!/usr/bin/env node
+/**
+ * Audit test-file presence across modules. Which modules have zero
+ * test files? Which have comprehensive coverage?
+ *
+ * This is a file-level heuristic, not a line-coverage metric — running
+ * `vitest --coverage` is the real thing, but:
+ *   1. 34/653 tests currently fail (2026-04-22; related to in-flight
+ *      spaces-foundation work), so coverage thresholds aren't
+ *      enforceable yet.
+ *   2. File-presence is a faster, more stable signal for "which module
+ *      has no automated regression protection at all?" — enough to
+ *      prioritise the next session's test-writing effort.
+ *
+ * Scope: `apps/mana/apps/web/src/lib/modules/*` subdirectories. For each
+ * module, count:
+ *   - .svelte files (UI surface)
+ *   - .ts files (types, queries, stores, etc.)
+ *   - .test.ts / .spec.ts files (tests)
+ *   - Percentage of source files that have a sibling test
+ *
+ * Also include top-level packages/shared-* for completeness.
+ *
+ * Usage:
+ *   node scripts/audit-test-coverage.mjs
+ *   node scripts/audit-test-coverage.mjs --summary
+ */
+
+import { readdirSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const REPO_ROOT = join(__dirname, '..');
+const MODULES_DIR = join(REPO_ROOT, 'apps/mana/apps/web/src/lib/modules');
+
+const SUMMARY = process.argv.includes('--summary');
+
+const SKIP_DIRS = new Set(['node_modules', 'dist', 'build', '.svelte-kit']);
+
+function walk(dir, collect) {
+	for (const ent of readdirSync(dir, { withFileTypes: true })) {
+		if (SKIP_DIRS.has(ent.name)) continue;
+		const p = join(dir, ent.name);
+		if (ent.isDirectory()) walk(p, collect);
+		else if (ent.isFile()) collect(p);
+	}
+}
+
+function classify(files) {
+	let svelte = 0;
+	let ts = 0;
+	let tests = 0;
+	for (const f of files) {
+		if (f.endsWith('.test.ts') || f.endsWith('.spec.ts') || f.endsWith('.test.svelte')) {
+			tests++;
+		} else if (f.endsWith('.svelte')) {
+			svelte++;
+		} else if (f.endsWith('.ts') && !f.endsWith('.d.ts')) {
+			ts++;
+		}
+	}
+	return { svelte, ts, tests };
+}
+
+function audit() {
+	const moduleNames = readdirSync(MODULES_DIR, { withFileTypes: true })
+		.filter((e) => e.isDirectory())
+		.map((e) => e.name)
+		.sort();
+
+	const rows = [];
+	for (const mod of moduleNames) {
+		const files = [];
+		try {
+			walk(join(MODULES_DIR, mod), (p) => files.push(p));
+		} catch {
+			continue;
+		}
+		const c = classify(files);
+		const source = c.svelte + c.ts;
+		const coverage = source === 0 ? 0 : c.tests / source;
+		rows.push({ module: mod, ...c, source, coverage });
+	}
+
+	const withTests = rows.filter((r) => r.tests > 0).length;
+	const withoutTests = rows.filter((r) => r.tests === 0).length;
+	const totalTests = rows.reduce((s, r) => s + r.tests, 0);
+	const totalSource = rows.reduce((s, r) => s + r.source, 0);
+
+	console.log(`\n── Test coverage audit (file-presence) ─────────────────\n`);
+	console.log(`Modules:             ${rows.length}`);
+	console.log(`  with ≥1 test:      ${withTests}`);
+	console.log(`  without any test:  ${withoutTests}`);
+	console.log(`Total source files:  ${totalSource} (.svelte + .ts)`);
+	console.log(`Total test files:    ${totalTests}`);
+	console.log(
+		`Overall file ratio:  ${((totalTests / totalSource) * 100).toFixed(1)}% (target: ≥25% for hot modules)`
+	);
+	console.log('');
+
+	const zeroTests = rows
+		.filter((r) => r.tests === 0 && r.source >= 3)
+		.sort((a, b) => b.source - a.source);
+	if (zeroTests.length > 0) {
+		console.log(`Modules with 0 test files and ≥3 source files (top 15):\n`);
+		for (const r of zeroTests.slice(0, 15)) {
+			console.log(`  ${String(r.source).padStart(3)} src  ${r.module}`);
+		}
+		console.log('');
+	}
+
+	if (SUMMARY) return;
+
+	const withSome = rows.filter((r) => r.tests > 0).sort((a, b) => b.coverage - a.coverage);
+	if (withSome.length > 0) {
+		console.log(`Modules with ≥1 test (by file ratio):\n`);
+		for (const r of withSome) {
+			const bar = '█'.repeat(Math.round(r.coverage * 20)).padEnd(20, '·');
+			console.log(
+				`  ${bar}  ${(r.coverage * 100).toFixed(0).padStart(3)}%  ` +
+					`${r.tests}/${r.source} files  ${r.module}`
+			);
+		}
+		console.log('');
+	}
+
+	// Report-only; never exit non-zero.
+}
+
+audit();