- Removed export leakage by demoting many helper and const symbols to module-local scope.
- Renamed underscore-prefixed internals and cache fields, then updated related references and `satisfies never` checks.
- Deleted obsolete logic branches and helpers, including harmony-stream interruption flow and unused benchmark runtime helpers.
- Updated Biome config and manifests by broadening lint coverage and removing an unused `@napi-rs/cli` dev dependency.
- Adjusted tests and utilities to use renamed test helpers and remove redundant private test-only helpers/locals.
- Added automatic migration of legacy absolute-path session directories with double-dash format to new canonical locations.
- Enhanced session directory encoding to use `-tmp-` prefix for temporary directories instead of legacy double-dash format for improved clarity.
- Extracted session directory migration logic into reusable helper functions for better maintainability.
- Updated test setup to mock home directory and verify session migration behavior with temporary paths.
- Added `toExtensionId()` method to all capability types for granular extension identification and disabling.
- Added `disabledExtensions` and `includeDisabled` options to LoadOptions for filtering disabled capabilities by extension ID.
- Added plugin manifest support for `extensions` entry points with automatic discovery from installed plugins.
- Fixed skill loading to properly respect disabled skill names from custom directories.
- Improved cross-platform path handling by using `path.basename()` instead of string splitting in context file and state manager.
- Refactored capability index loading to validate source metadata and filter disabled extensions before processing.
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