- 28 symbols across discovery, mcp header policy, agent-hub projection and
rendering, the agent registry, shell tokenizing and changelog comparison
were exported but referenced only inside their own module; they are now
module-private, shrinking the deep-import surface.
- Kept AGENT_PLUGIN_MANIFEST_SCHEMA, AGENT_PLUGIN_MCP_SCHEMA,
parseAgentPluginManifest, clearAgentPluginRootCache and mergeMCPHeaders
exported: each is a seam for tests that defend real parsing or header
precedence behavior.
- Nothing reachable from an explicit exports entry or public barrel changed.