feat(releaser): release v1.5.0 — Node.js, multi-module Maven, configurable bump rules

- Add internal/node package: reads/writes package.json version (single or
  multi-path via node.package_json / node.package_jsons)
- Add maven.pom_paths support: update multiple pom.xml files in one release
  commit; pom_paths overrides pom_path; --pom flag clears pom_paths
- Add git.bump_rules config: per-type control of which version component bumps
  (breaking/feat/fix accept "patch" or "minor"); wired through version.Next()
  as a new sixth parameter
- Extract injectable function vars (absPath, gitAllCommits, gitCommitsSince,
  gitCommitFiles) to enable error-path testing without interfaces
- Achieve 100% per-package statement coverage across all 12 packages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.releaser.yml

@@ -19,10 +19,37 @@ git:
   # author_name: ""
   # author_email: ""
 
-maven:
-  # Path to pom.xml, relative to the repository root.
+  # Limit which commit types trigger a release (default: fix, feat, breaking).
+  # releasable_types:
+  #   - fix
+  #   - feat
+  #   - breaking
+
+  # Configure which version component each commit type bumps.
+  # Valid values: "patch" (default) or "minor".
+  # bump_rules:
+  #   breaking: "minor"
+  #   feat: "patch"
+  #   fix: "patch"
+
+# maven:
+  # Single pom.xml path, relative to the repository root.
   # pom_path: "pom.xml"
 
+  # Multiple pom.xml paths for multi-module projects (overrides pom_path).
+  # pom_paths:
+  #   - "pom.xml"
+  #   - "module-a/pom.xml"
+
+# node:
+  # Single package.json path (node processing is opt-in — no default).
+  # package_json: "package.json"
+
+  # Multiple package.json paths for monorepos (overrides package_json).
+  # package_jsons:
+  #   - "packages/frontend/package.json"
+  #   - "packages/backend/package.json"
+
 gitlab:
   # GitLab instance URL. Falls back to the CI_SERVER_URL environment variable.
   # url: "https://gitlab.example.com"