test(config-audit): add marketplace-small/medium/large scanner fixtures

plugins/config-audit/tests/fixtures/marketplace-large/CLAUDE.md

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+# Marketplace Large
+
+A large marketplace fixture with 6+ plugins, deep CLAUDE.md content,
+multiple hook event types, multiple MCP servers, and extensive shared
+configuration. Intended to produce a strictly larger total-estimated-tokens
+count than the small or medium fixtures.
+
+## Plugins
+
+- plugin-alpha — linting and static analysis
+- plugin-beta — code formatting
+- plugin-gamma — test runner and coverage
+- plugin-delta — release automation and tagging
+- plugin-epsilon — configuration auditing
+- plugin-zeta — security scanning
+- plugin-eta — documentation generation
+- plugin-theta — dependency management
+
+## Commands
+
+- `npm run build` — Build all workspace packages
+- `npm test` — Run the entire test suite
+- `npm run lint` — Run all linters
+- `npm run format` — Auto-format all source files
+- `npm run release` — Cut a new release
+- `npm run audit` — Security audit of dependencies
+- `npm run docs:build` — Build documentation site
+- `npm run docs:serve` — Serve documentation locally
+- `npm run typecheck` — Type-check without emitting
+- `npm run clean` — Remove build artifacts
+
+## Architecture
+
+The marketplace hosts multiple plugins, each self-contained. Inter-plugin
+communication happens via well-defined contracts; no plugin imports from
+another directly. Shared primitives live in a workspace package consumed
+by every plugin.
+
+## Conventions
+
+- Conventional Commits with plugin scope: `feat(plugin-name): description`
+- Semantic versioning per plugin, coordinated via a release-please-style flow
+- Tests live alongside implementation files as `*.test.mjs`
+- Zero runtime npm dependencies in hooks and scanners where possible
+
+## Tooling
+
+- Node.js ≥ 18 (ES Modules, node:test)
+- TypeScript strict mode
+- ESLint + Prettier
+- Shared git hooks via `hooks/hooks.json`
+
+## Release Process
+
+Each plugin version-bumps independently. The marketplace root README and
+per-plugin README are updated in the same commit as the version bump. A
+tag of the form `{plugin}-v{semver}` is pushed to Forgejo alongside the
+main branch commit.
+
+## Shared Patterns
+
+Shared conventions and helper patterns are defined in the imported files
+below. Each import is a logical slice: one for naming conventions, one
+for error-handling patterns, one for test patterns.
+
+@.claude/shared-naming.md
+@.claude/shared-errors.md
+@.claude/shared-tests.md