…r output

Make xcresult handling consistent across shared, macOS, and device test tools. Parse totalTestCount with strict numeric checks so empty/invalid values cannot suppress build-output fallback behavior.

Filter stderr at line level instead of dropping entire text blocks. This preserves useful status and diagnostics while still removing stderr noise when xcresult summaries are authoritative.

Extract shared stderr content filtering into a common utility to remove duplication and keep behavior aligned across test paths.

Update device tool tests to assert summary-first ordering.

Fixes getsentry#254

…ry boundary

Move consolidation from individual call sites (build-utils, test-common)
into the typed-tool-factory handlers so it applies once at the boundary.
This eliminates scattered consolidation calls and simplifies logic functions.

Supporting changes:
- Cache isRunningUnderClaudeCode() result since it runs on every tool call
- Accept optional EnvironmentDetector in consolidation for testability
- Inject CommandExecutor/FileSystemExecutor into test-common for DI
- Simplify filterStderrContent now that separator cleanup is unnecessary
- Add unit tests for consolidation logic and factory wiring

- Reduce verbose type guards in test_macos formatTestSummary using
  direct casts and nullish coalescing
- Remove unused JSDoc typedef for TestSummary in test_macos
- Consolidate enforceInstallPolicy guard conditions into single check
- Simplify init report agentsGuidance construction
- Remove stale comments in test_device