Phase 2 - Ecosystem Alignment and Release Tooling

Contract change type: additive

Added

• Added @phcdevworks/spectre-manifest as a devDependency. spectre.manifest.json
  at the repo root declares this package's ecosystem role, layer, exports, and
  allowed dependency targets. check:ecosystem validates it in the check pipeline.
• Added shell-app template — a full shell starter wiring bootstrapApp, the
  router, reactive signals/effects, and @phcdevworks/spectre-components
  (sp-button).
• Added check:version-sync script (scripts/check-readme-version.ts) that
  verifies README version references stay in sync with package.json; wired
  into npm run check.
• Added release:propose script (scripts/propose-version.ts) that suggests
  the next semantic version bump based on [Unreleased] change classification.

Changed

• Bumped @phcdevworks/spectre-manifest devDependency range to ^1.1.0.
• Bumped typescript-eslint devDependency to ^8.63.0.
• Bumped template dependency pins: @phcdevworks/spectre-tokens to 3.3.1,
  @phcdevworks/spectre-ui to 2.7.1, @phcdevworks/spectre-ui-astro
  reference to 3.4.1.