v1.4.488

## Changes

### PR [#2207](https://github.com/danielmiessler/Fabric/pull/2207) by [scottidler](https://github.com/scottidler) and [ksylvan](https://github.com/ksylvan): fix(anthropic): adaptive thinking on Claude 5 + add --maxTokens flag

- Added a `--maxTokens` CLI flag that caps model output tokens, wiring the existing `ChatOptions.MaxTokens` field through to the provider; a value of `0` preserves the vendor default, so existing behavior is unchanged.
- Fixed Anthropic thinking support on Claude 5 models (`claude-sonnet-5`, `claude-opus-5`, `claude-fable-5`), which rejected the legacy `thinking.type=enabled` plus `budget_tokens` shape and returned HTTP 400 for every `--thinking` value except `off`.
- Reworked `parseThinking` to select the correct request shape per model: `thinking.type=disabled` for `off`, adaptive thinking with `output_config.effort` for Claude 5, and the legacy enabled/budget shape for older models.
- Preserved numeric thinking budgets on adaptive models by bucketing them onto the nearest effort level using the same thresholds as the named levels, so `--thinking=2048` and `--thinking=medium` behave consistently.
- Added `--maxTokens` shell completion support for Bash, Zsh, and Fish, treating it as an option that requires an argument.