feat(detector): add inspect surfaces, content-gate modes, and CLI refactors

[dev-pi2pie]

Summary

• add a first-class word-counter inspect command for detector diagnosis with pipeline and engine views
• add detector-subpath inspect APIs and exported inspect/debug types under @dev-pi2pie/word-counter/detector
• add configurable detector contentGate modes: default, strict, loose, and off
• align library inspect defaults with the documented WASM pipeline behavior
• add inspect batch support for repeated --path inputs, directory expansion, section selection, and JSON/standard output modes
• refactor detector/window-resolution logic into focused modules for policy, engine execution, window resolution, inspect shaping, and pre-segmentation
• refactor batch aggregation and path resolution into smaller modules while preserving CLI behavior
• add lint/format configs for oxlint and oxfmt

Details

• introduce route-aware detector policies for Latin and Hani handling, including eligibility thresholds, content-gate evaluation, corroboration rules, and borrowed Japanese context for mixed Hani windows
• preserve existing counting behavior while threading contentGate configuration through CLI, detector-subpath runtime APIs, inspect output, debug summaries, and detector evidence
• extend CJS and package exports to cover the new detector inspect/debug surface
• update README, schema docs, research docs, plans, and job records for the new inspect/content-gate contracts

Testing

• add broad regression coverage for:
  • inspect command behavior
  • detector policy behavior
  • detector inspect library API
  • detector counting/runtime entrypoints
  • batch output and path resolution
  • package types and CJS interop
• verified with targeted Bun test suites across inspect, detector, batch-output, path-resolution, package-types, and compatibility coverage