v0.54.0: Readiness report improvements and AskUser fixes

New features

- OTEL metrics for hooks and slash commands - Customer metrics for droid.hook.invocations and droid.slash_command.invocations
- Optional /readiness-report model switching - Users can now continue with their current model while seeing a recommendation, instead of being forced to switch

Improvements

- Autonomy indicator format - Updated format to show Spec | Auto (X) when spec mode is active; Medium shortened to Med

Bug fixes

- AskUser tool improvements - Questionnaire parsing now supports bullets/1) numbering, ignores headers/code fences, normalizes multi-word topics. AskUser can now run alongside TodoWrite with other tools deferred properly. Fixed TUI input handling via KeypressProvider subscription
- Windows UI - Improved autonomy/spec mode status text rendering on Windows terminals