Patch release closing two CR-39 violations discovered via end-to-end fixture verification of `npx massu init` against all six Phase 7 frameworks.

Patch release closing two CR-39 violations discovered via end-to-end fixture verification of npx massu init against all six Phase 7 frameworks. Phoenix and ASP.NET projects could not previously install Massu (error: no languages detected); Rails / Spring / Go-chi installed but emitted generic configs missing the framework-specific variant template's framework.router, paths.source, and verification.<lang>.lint fields.

Daemon code unchanged from 1.5.0 — the in-flight 1.5.0 48 h soak verdict (started 2026-05-08T15:21:23Z) applies to 1.5.1.

Added

• Canonical manifest registry (packages/core/src/detect/manifest-registry.ts) — single source-of-truth for every recognized manifest file. Both package-detector.ts (init's framework-detection layer) and runner.ts:buildDetectionSignals (AST adapter signal layer) consume from this registry. Adding a new manifest type now requires exactly one entry; both consumers automatically pick it up. Replaces the two parallel hand-rolled lists that diverged during Phase 7.
• Elixir + C# manifest support — mix.exs and *.csproj now recognized by package-detector. Closes the CR-39 gap where Phoenix and ASP.NET projects failed npx massu init even though their AST adapters worked correctly. Includes new parseMixExs and parseCsproj parser functions; the csproj parser also extracts the <Project Sdk="..."> attribute for SDK-style detection.
• Variant template merge (applyVariantTemplate in commands/init.ts) — when framework.languages.<lang>.framework resolves to a known id, init now reads the matching packages/core/templates/<id>/massu.config.yaml and selectively merges its framework.router, framework.orm, framework.ui, paths.source, and verification.<lang>.{lint,syntax,test,type,build} fields. Closes the gap where rails/spring/go-chi/phoenix init succeeded but the resulting config lacked the framework's canonical lint command (rubocop / credo / golangci-lint / etc.) and routing identifier.
• Framework-detector rules for elixir + csharp — phoenix ({:phoenix, ...} in mix.exs), aspnet-core (Microsoft.AspNetCore.App / .Mvc PackageReference, Microsoft.NET.Sdk.Web Sdk attribute), ex-unit test framework, xunit, ecto, ef-core ORM. go-chi rules expanded to cover all major-versioned import paths (github.com/go-chi/chi/v2 through /v5).
• Strict gate manifest-registry-drift.test.ts — 10 assertions: every entry has a callable parse function, unique pattern, well-formed shape; the MANIFEST_FILES const is permanently retired; every Phase 7 framework adapter language has a registry entry; every non-null signalKey corresponds to a real DetectionSignals field.
• Strict gate init-end-to-end.test.ts — 5 fixture-based end-to-end tests (rails, phoenix, aspnet, spring, go-chi) that run runInit against minimal projects in tmpdir() and assert the emitted massu.config.yaml carries the variant-template-defined framework.router, paths.source, and verification.<lang>.lint. The class of bug "init succeeded but variant template missing" is now structurally impossible to merge.

Fixed

• CR-39 violation: Phoenix + ASP.NET fixtures fail npx massu init — root cause: package-detector.ts:122-132 had a MANIFEST_FILES list missing mix.exs and *.csproj. Closed by manifest registry + new parsers.
• Variant template paths.source for ASP.NET — was src (which doesn't exist by ASP.NET Core convention); now . (project root). ASP.NET projects place Controllers/, Pages/, Program.cs etc. at the project root.
• source-dir-detector.ts extension map missing elixir / csharp — added .ex/.exs and .cs extensions plus their respective test-file regex patterns (_test.exs, Tests?.cs, .Tests?/).

Verification

• npx tsc --noEmit: 0 errors
• npm test: 2079/2079 pass (+15 new structural tests, zero regressions)
• bash scripts/massu-pattern-scanner.sh: PASS
• bash scripts/massu-generalization-scanner.sh: PASS
• 5-fixture re-verification: all six Phase 7 frameworks (rails, phoenix, aspnet, spring, go-chi, python-flask covered transitively via SUPPORTED_LANGUAGE) produce valid massu.config.yaml with variant-template-merged fields.

Known follow-on

• AST adapter introspect output (detected.<adapter-id>: block in emitted config) is still NOT piped through to init. The blocker is codebase-introspector.ts:160-180 sampleFiles returning [] — adapters run but see zero source files. Closing this requires a real file-sampling layer; see follow-on plan to come.