Shorten the completion config field name for better readability.

BREAKING CHANGE: `completion.function_paren_check_limit` config key renamed to `completion.auto_paren_limit`

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Replace the free-form string field with a proper enum (`Emacs` | `Vi`)
for type-safe mode matching and better JSON Schema output.

BREAKING CHANGE: `editor.mode` now only accepts "emacs" or "vi" (previously accepted any string with "vim" alias)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Add a color_prop! macro that generates proper oneOf schema for Color
values (named string enum, { Fixed: N }, { Rgb: [r,g,b] }) and use it
for all color properties in ColorsConfig and SpinnerConfig schemas.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Update version, CHANGELOG, documentation, and schema artifact to
reflect the breaking config changes in this release.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

- Add #[serde(alias = "vim")] to EditorMode::Vi for backward compat
- Restore "default": "Cyan" for SpinnerConfig color in JSON Schema
- Add detailed frames description with examples in SpinnerConfig schema
- Update CHANGELOG to note "vim" alias is still accepted
- Remove unused color_prop re-export from colors.rs

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Merge the migration guide from [0.2.0-beta.1] into [Unreleased] and
update it to include all breaking config changes (autosuggestion,
function_paren_check_limit, reprex section reorg) with a clear
before/after comparison table.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Add a `default` variant to the color_prop! macro and re-export it for
use in experimental.rs, eliminating the duplicated color oneOf schema
definition in SpinnerConfigSchema.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Replace the duplicated oneOf definition across two macro arms with a
single make_color_schema() helper function. The macro now delegates to
the function, keeping the color variant list in one place.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Remove #[serde(alias = "vim")] from EditorMode::Vi to make a clean
breaking change consistent with the other renames. Also fix rustfmt
formatting in color_prop! macro.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Add a row to the migration table for the editor.mode value change
from "vim" to "vi", so users scanning the guide won't miss it.

Co-Authored-By: Claude Opus 4.5 <[email protected]>