tech-debt(forks): resolve the 'agents-kb' batch of symbol-fork baseline clusters — merge real forks, rename homonyms apart #18457

Parent: #17312. Triage method: #12771 (same name is not the same concept).

A batch of repo_tests/symbol_fork_baseline.json clusters whose files (23) touch no file of any open PR as of 2026-10-12.

Clusters: Verdict, AgentType, ClassificationResult, CodeSearchResult, ManPageParser, IntentClassifier, analyze_module, analyze_package, ElementType, OptimizationCategory, get_async_default_client, EntityResolver, SearchAnalytics

Acceptance criteria

• Each cluster is classified with evidence, as either a REAL FORK or a HOMONYM.
• Real forks are merged into ONE canonical definition, and every caller is repointed.
• Homonyms are renamed apart, with names that say what each one is.
• Every resolved name is removed from symbol_fork_baseline.json; the ratchet only shrinks.
• Each merged fork has a test showing the canonical definition serves the former callers.