feat: run local Dart tasks via Dagger (#417) (#418)
## Summary
- Adds \`CheckFast\`, \`Analyze\`, \`FormatWrite\`, \`Codegen\`, and \`AnalyzeFix\` Dagger functions to \`ci/main.go\`
- Updates \`format\`, \`codegen\`, \`analyze\`, \`analyze-fix\`, and \`check-fast\` Taskfile tasks to delegate to Dagger and export modified files back to the host (\`-o .\`)
- Updates the \`dart-check\` pre-commit hook to run \`dagger call ... check-fast\` instead of \`scripts/pre_commit_check.sh\`
These tasks no longer require a local Dart/Flutter SDK installation — Dagger pulls the toolchain image and runs everything in a container.
## New Dagger functions
| Function | Returns | What it does |
|---|---|---|
| \`CheckFast(ctx)\` | \`string\` | Runs CheckHygiene, CheckLayers, Format, Analyze, CheckMocks, Coverage in parallel |
| \`Analyze(ctx)\` | \`string\` | \`dart analyze --fatal-infos\` |
| \`FormatWrite()\` | \`*dagger.Directory\` | \`dart format lib test\` — writes files, returns \`/src\` |
| \`Codegen()\` | \`*dagger.Directory\` | \`flutter pub run build_runner build\` — returns \`/src\` with generated files |
| \`AnalyzeFix()\` | \`*dagger.Directory\` | \`dart fix --apply\` — writes files, returns \`/src\` |
## Test plan
- [ ] \`task format\` — runs Dagger, exports formatted files back to \`.\`
- [ ] \`task codegen\` — runs Dagger, exports generated \`.g.dart\` files back to \`.\`
- [ ] \`task analyze\` — runs Dagger, prints analysis output
- [ ] \`task analyze-fix\` — runs Dagger, exports fixed files back to \`.\`
- [ ] \`task check-fast\` — runs all fast checks in parallel via Dagger
- [ ] Pre-commit hook triggers \`dagger call ... check-fast\` on commit
Closes #417
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Co-authored-by: Thomas SharedInbox <sharedinbox@thomas-guettler.de>
Co-authored-by: guettli <guettli@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/guettli/sharedinbox/pulls/418
