ci: move release-plz flow into mise tasks

[zeitlinger]

What changed

This moves the release-plz workflow logic into repository-owned mise tasks and keeps the release-managed README snippets in sync from the repo itself.

• move release helpers into .mise/tasks/release/*
• run release creation and release PR updates through mise instead of the dedicated release-plz action wrapper
• rename the binary-release workflow to release-assets.yml and trigger it from the repo-managed release task
• add sync-readme-snippets plus drift tests so README tool/version snippets stay aligned with current repo state
• remove the README-specific Renovate rule in favor of scripted sync plus test coverage
• add --allow-fixed so the docs-sync task can auto-fix generated docs and still succeed when everything was fixed cleanly

Why

This keeps the release workflow logic in the repository, makes local and CI behavior match more closely, and replaces ad hoc README version maintenance with a repeatable sync path guarded by tests.

Validation

• cargo test readme_ -- --nocapture
• cargo test repo_renovate_config_stays_aligned_with_shared_preset_contract -- --nocapture
• mise run lint:fix
• mise run lint

[Copilot]

Pull request overview

This PR moves release automation into repo-owned mise tasks, adds automated syncing/testing for README tool/version snippets, and updates flint to support a --allow-fixed mode for autofix workflows.

Changes:

• Add --allow-fixed to flint run --fix and add CLI/e2e coverage around the new behavior.
• Introduce sync-readme-snippets plus a drift test to keep README mise.toml snippets aligned with repo tool versions.
• Rework release management to use mise tasks (and rename the binary release workflow to release-assets.yml), and simplify Renovate rules accordingly.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/cases/shfmt/auto-fix-allow-fixed/test.toml	Adds an e2e case asserting --allow-fixed succeeds after applying fixes.
tests/cases/shfmt/auto-fix-allow-fixed/files/script.sh	Fixture shell script used by the new shfmt autofix test.
tests/cases/shfmt/auto-fix-allow-fixed/files/mise.toml	Fixture mise.toml pinning shfmt for the new test.
tests/cases/general/allow-fixed-requires-fix/test.toml	Adds a CLI validation test that --allow-fixed requires --fix.
tests/cases/general/allow-fixed-requires-fix/files/.gitkeep	Empty fixture directory placeholder for the new CLI test case.
src/registry/tests.rs	Adds README snippet drift test and updates generated docs scope links.
src/main.rs	Implements --allow-fixed flag and threads it through fix outcome handling.
src/bin/sync-readme-snippets.rs	New helper binary to rewrite README fenced TOML blocks from repo state.
release-plz.toml	Simplifies release-plz config by removing custom PR body.
mise.toml	Adds release-plz tool, updates lint tasks to run the flint bin explicitly, and adds a release PR task.
docs/linters.md	Updates scope links/section structure for per-scope anchors.
README.md	Updates tool versions/snippets and tweaks setup wording.
.mise/tasks/release/update	New task to run release-plz update then sync release-managed docs.
.mise/tasks/release/docs-sync	New task to sync README snippets and run flint in fix mode with --allow-fixed.
.mise/tasks/release/create	New task to create releases (JSON output) and trigger the assets workflow.
.github/workflows/release-plz.yml	Switches from release-plz/action to mise-driven release management.
.github/workflows/release-assets.yml	Renames the workflow display name to match new release assets naming.
.github/renovate.json5	Removes the README-specific Renovate rule now covered by sync + tests.
.github/renovate-tracked-deps.json	Updates tracked workflow paths after renames/adjustments.

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