## BitLogger Update Changes

version 0.4.0

### Feature
- feat: add `ColorMode = Never | Auto | Always` for text formatter color control
- feat: add ANSI level, target, timestamp, and field rendering to `format_text(...)`
- feat: add `color_mode` to `TextFormatter` and `TextFormatterConfig`
- feat: support `text_formatter.color_mode` in JSON config parsing and serialization
- feat: add inline style markup support in message text for ANSI text formatter output
- feat: support named color tags like `<red>...</>`, style tags like `<b>...</>`, and hex tags like `<#ff0000>...</>` / `<bg:#010203>...</>`
- feat: keep JSON formatter output unchanged and limit inline style parsing to text message rendering only
- feat: add `TextStyle`, `StyleTagRegistry`, `style_tag_registry()`, and `default_style_tag_registry()` for reusable inline style tags
- feat: add formatter-local `style_tags`, global style tag registry helpers, builtin-tag override support, and alias reuse via `define_alias(...)`
- feat: support minimal `sink.text_formatter.style_tags` JSON config parsing and serialization for custom formatter tag styles
- feat: add `StyleMarkupMode = Disabled | Builtin | Full` plus formatter helpers so callers can explicitly disable style parsing or allow builtin-only parsing
- feat: support `sink.text_formatter.style_markup` in JSON config parsing and serialization
- feat: add builtin semantic style tags such as `accent`, `info`, `success`, `warning`, `danger`, and `muted`
- feat: add independent `target_style_markup` and `fields_style_markup` controls for `TextFormatter` and `TextFormatterConfig`
- feat: support named closing tags like `</red>` alongside the existing short close `</>`
- feat: add `ColorSupport = Basic | TrueColor` and support `sink.text_formatter.color_support` so hex / RGB styles can downgrade to basic ANSI colors

### Test
- test: cover ANSI text formatter rendering in `Always` mode
- test: cover `Auto` mode fallback behavior when `NO_COLOR` is present
- test: cover config parsing and serialization for `color_mode`
- test: cover named inline color tags in ANSI mode
- test: cover plain mode tag stripping, nested tags, hex tags, and unknown-tag fallback behavior
- test: cover custom tags, builtin-tag override, formatter-vs-global priority, global registry fallback, and alias reuse
- test: cover formatter `style_tags` JSON parsing, config roundtrip, JSON helper export, and config-driven styled formatter rendering
- test: cover disabled markup mode, builtin-only mode, and config-driven `style_markup` behavior
- test: cover builtin semantic tag rendering and confirm user overrides still take precedence
- test: cover target and field markup rendering, plus config roundtrip for the new formatter markup scopes
- test: cover named closing tags, mixed short/named closing, and unmatched named-close fallback behavior
- test: cover basic color-support downgrade for hex foreground/background rendering in runtime and config paths

### Example

- docs: add `color_mode` usage examples to formatter documentation
- docs: add runtime and JSON `style_tags` examples, and document current JSON schema scope
- docs: add runtime and JSON examples for toggling style markup parsing

### Notes
- `Auto` currently uses a conservative rule: if `NO_COLOR` exists, ANSI is disabled; otherwise ANSI is enabled
- inline style markup supports both short close `</>` and named closing tags like `</red>`
- unknown or invalid inline tags currently fall back to plain text and do not raise formatter errors
- formatter-local tag lookup currently takes precedence over global tag lookup, and global lookup takes precedence over builtin tags
- JSON config currently supports concrete style objects only; alias-style declarations remain runtime-only
- users can now decide whether custom style parsing is enabled through runtime formatter APIs or `sink.text_formatter.style_markup`
- `fields_style_markup` currently styles field values only and intentionally leaves field keys raw
- `basic` color support currently keeps ANSI styling but downgrades hex / RGB colors to the nearest basic ANSI color family