Add verbose mode, logging levels, log file output

[grave0x]

Summary

Adds proper logging infrastructure with configurable verbosity, log file output, and structured log levels.

CLI flags

dwell -v doctor              # Debug level (also affects trait filter)
dwell -vv doctor             # Trace level
dwell --log-level debug doctor  # Explicit level override
dwell --log-file ~/dwell.log apply  # Write logs to file
dwell --quiet apply          # Only errors shown

Implementation

Output struct enhancements

• Added level field (1-5 mapping: error→trace)
• debug() method — dim blue dot, only at -v/--log-level=debug
• trace() method — dim magenta hash, only at -vv/--log-level=trace
• All methods check self.level before printing
• Respects --quiet (only error level shows)

tracing_subscriber upgrade

• Respects --log-level override
• Supports --log-file <path> for file output
• Falls back to stderr if file cannot be opened
• No timestamp clutter in stderr mode

17 files updated

All Output::new() callers across all command modules.

Closes #26

Summary by Sourcery

Introduce configurable logging levels and optional log file output across the CLI, and route all command output through the new log-level-aware Output abstraction.

New Features:

• Add CLI flags for explicit log level selection and log file output.
• Add debug and trace output methods with structured, level-tagged messages in both text and JSON modes.

Enhancements:

• Refine Output struct to use a unified numeric log level that honors verbosity and quiet settings instead of ad-hoc checks.
• Update all command modules to construct Output with the resolved log level from CLI options.
• Configure tracing subscriber to respect the chosen log level and optionally write logs to a file, falling back to stderr on failure.

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