feat: replace codespell with typos

[zeitlinger]

What changed

This replaces Flint's codespell integration with typos.

• register typos instead of codespell
• install it via aqua:crate-ci/typos
• manage _typos.toml as Flint-owned config
• run typos with --force-exclude
• replace the old codespell fixture coverage with real typos-backed cases

Config migration

For maintained repos, Flint now does a Flint-native migration from legacy Codespell config:

• migrate ignore-words-list
• migrate words from .codespellignore
• do not migrate skip
• do not migrate check-hidden

This keeps the generated Typos config aligned with how Flint invokes the checker, rather than preserving standalone Codespell traversal behavior.

Validation

• cargo test
• mise run lint:fix
• mise run lint
• temp-repo smoke test against a maintained repo (mox) for the config migration flow

Follow-up

The smoke test exposed one remaining issue outside this PR's scope: when migrating mise.toml, a legacy pipx:codespell version string is currently preserved verbatim when rewriting to aqua:crate-ci/typos, which can produce an invalid Typos version. That should be fixed in a follow-up.

[Copilot]

Pull request overview

This PR replaces Flint’s spelling checker integration from codespell to typos, including updating the check registry/tooling, adding a Flint-owned _typos.toml config flow, and introducing a Flint-native migration from legacy .codespellrc / .codespellignore.

Changes:

• Register a new typos check (invoked with --force-exclude) and remove codespell from the built-in registry.
• Add a setup migration that converts legacy Codespell ignore-word settings into FLINT_CONFIG_DIR/_typos.toml and removes legacy files.
• Update documentation, Renovate tracking, and test fixtures to reflect typos behavior (including fix-mode cases).

Reviewed changes

Copilot reviewed 45 out of 45 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/cases/typos/failure/test.toml	Adds failing typos case expectations/output matching.
tests/cases/typos/failure/files/README.md	Fixture file containing a known typo (teh).
tests/cases/typos/failure/files/mise.toml	Installs typos in fixture toolchain.
tests/cases/typos/clean/test.toml	Updates clean spelling case to run typos instead of codespell.
tests/cases/typos/clean/files/README.md	Clean spelling fixture content.
tests/cases/typos/clean/files/mise.toml	Installs typos in clean-case fixture.
tests/cases/typos/auto-fix/test.toml	Adds typos auto-fix case expectations.
tests/cases/typos/auto-fix/files/README.md	Fixture file for auto-fix (teh → the).
tests/cases/typos/auto-fix/files/mise.toml	Installs typos in auto-fix fixture.
tests/cases/general/unsupported-typos-config/test.toml	Adds failure case for unsupported .typos.toml config location.
tests/cases/general/unsupported-typos-config/files/mise.toml	Installs typos for unsupported-config fixture.
tests/cases/general/unsupported-typos-config/files/.typos.toml	Adds unsupported config file fixture.
tests/cases/general/unsupported-codespellrc-config/test.toml	Adds failure case for legacy .codespellrc now treated as unsupported for typos.
tests/cases/general/unsupported-codespellrc-config/files/mise.toml	Installs typos for legacy-config fixture.
tests/cases/general/unsupported-codespellrc-config/files/.codespellrc	Adds legacy codespell config fixture.
tests/cases/general/unsupported-codespell-config/test.toml	Removes obsolete codespell unsupported-config test.
tests/cases/general/unsupported-codespell-config/files/setup.cfg	Removes obsolete codespell config fixture.
tests/cases/general/unsupported-codespell-config/files/mise.toml	Removes obsolete codespell tool fixture.
tests/cases/general/init-idempotent/files/mise.toml	Updates init-idempotent fixture to include typos instead of pipx:codespell.
tests/cases/general/flint-setup-obsolete-key/test.toml	Updates expected stdout for additional tool key replacements/normalization messaging.
tests/cases/general/flint-setup-codespell-config-migration/test.toml	Adds end-to-end fixture validating Codespell→Typos config migration output.
tests/cases/general/flint-setup-codespell-config-migration/files/mise.toml	Fixture includes typos tool and FLINT_CONFIG_DIR.
tests/cases/general/flint-setup-codespell-config-migration/files/.codespellrc	Legacy codespellrc fixture input for migration.
tests/cases/general/flint-setup-codespell-config-migration/files/.codespellignore	Legacy ignore-words file fixture input for migration.
tests/cases/codespell/failure/test.toml	Removes codespell failure fixture coverage.
tests/cases/codespell/failure/files/README.md	Removes codespell failure README fixture.
tests/cases/codespell/failure/files/mise.toml	Removes codespell tool fixture.
tests/cases/codespell/clean/files/README.md	Removes codespell clean README fixture.
tests/cases/codespell/clean/files/mise.toml	Removes codespell clean tool fixture.
tests/cases/codespell/clean/files/.github/config/.codespellrc	Removes codespell config fixture.
src/registry/checks.rs	Replaces codespell check registration with typos, including unsupported config detection and tool key migration list.
src/main.rs	Updates embedded examples/table output to list typos instead of codespell.
src/linters/typos.rs	Introduces typos init hook and Codespell→Typos config migration implementation + unit tests.
src/linters/renovate_deps/tests.rs	Renames a test for correct spelling (“unparsable”).
src/linters/mod.rs	Exposes new typos module.
src/linters/flint_setup.rs	Ensures setup migration drift is detected even when no other errors are present.
src/init/tests.rs	Updates expectations to reflect toolchain changes (typos vs pipx:codespell).
src/init/mod.rs	Updates profile/category labels to mention typos.
src/init/migrations.rs	Integrates typos migration into setup migration detection/application flow and message printing.
README.md	Updates the registry table to list typos and removes codespell.
mise.toml	Replaces pipx:codespell with typos for repo tooling.
docs/linters.md	Removes codespell docs section and adds typos docs section.
default.json	Updates Renovate preset tool list to include typos instead of pipx:codespell.
.github/renovate.json5	Updates Renovate config tool grouping to include typos.
.github/renovate-tracked-deps.json	Removes tracking for pipx:codespell and adds tracking for typos (GitHub releases).

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