Review and strip unused public API

[alexander-yevsyukov]

What

Resolves #11.

Reviewed every tool-base element marked
@SuppressWarnings("unused") /* Part of the public API. */ and traced each
across this repository's tests and downstream SpineEventEngine consumers.

Finding: all 13 are genuinely live — each has a real downstream consumer
and in-repo test coverage. None are dead, so nothing was removed from the
API. Instead, the now-stale suppressions are dropped: recent test additions
mean the in-repo tests already satisfy the unused-declaration inspection, so
the annotations were redundant.

Element	Downstream consumer
DefaultJsPaths	mc-js
ProtocPluginPath	mc-dart
DartFile.read	mc-dart
JavadocText.fromUnescaped / inPreTags	core-jvm-compiler
DefaultJavaPaths.src	protobuf-setup-plugins, core-jvm-compiler
Indent.shiftedRight / shiftedLeft	mc-js
FileName.isJava	doc-tools
ExternalModule.predefinedModules	mc-js
ExternalModules(ExternalModule...) / (Map<...>)	mc-js, mc-dart
FileWithImports.resolveImports	mc-dart

Verification

• ./gradlew build dokkaGenerate — BUILD SUCCESSFUL
• :tool-base:test — 219 passed, 0 failed, 1 skipped
• Reviewers: spine-code-review APPROVE, kotlin-engineer APPROVE
• Version bumped 2.0.0-SNAPSHOT.395 → .396

Note

This branch also carries two incidental maintenance commits that predate this
work (Update config, and a KManifestSpec test-matcher cleanup).

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (f80a009) to head (22f1284).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #176      +/-   ##
============================================
- Coverage     90.22%   90.17%   -0.05%     
  Complexity      552      552              
============================================
  Files           122      122              
  Lines          2230     2230              
  Branches        311      311              
============================================
- Hits           2012     2011       -1     
  Misses           96       96              
- Partials        122      123       +1     

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