* fix: add missing runtime field to ProjectConfigSchema and unify normalizeRuntime
ProjectConfigSchema.strict() rejected the runtime key in .takt/config.yaml
because the field was never added to the project-level Zod schema. The global
schema and piece-level schema already had it, so only project-level
runtime.prepare was broken ("Unrecognized key: runtime").
- Add runtime to ProjectConfigSchema and ProjectLocalConfig type
- Handle runtime in loadProjectConfig/saveProjectConfig
- Extract normalizeRuntime() into configNormalizers.ts as shared function
- Replace duplicated normalization in globalConfigCore.ts and pieceParser.ts
- Add 9 round-trip tests for project-level runtime.prepare
* fix: remove unnecessary comments from configNormalizers.ts
* fix: replace removed piece field with verbose in runtime test
The piece field was removed from ProjectConfigSchema in PR #465.
Update the test to use verbose instead.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
