Document development workflow

CONTRIBUTING.md

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+# Contributing
+
+1. Branch Strategy
+2. Development Workflow
+3. Commit Messages
+4. Definition of Done
+5. Coding Standards
+6. Documentation Requirements
+7. Testing
+8. Creating ADRs
+
+## Development Workflow
+
+See ADR 0010 for the overall development workflow.
+
+---
+
+## Commit Messages
+
+Commit messages should be:
+
+- short
+- descriptive
+- written in the imperative mood
+
+Examples:
+
+- Add meeting import
+- Implement transcript persistence
+- Refactor storage layer
+- Fix timestamp serialization
+
+Avoid messages such as:
+
+- Update
+- Changes
+- Fix
+- Miscellaneous

docs/adr/0010-development-workflow.md

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+# ADR 0010: Development Workflow
+
+## Status
+
+Accepted
+
+## Context
+
+The project is expected to evolve over an extended period and will be developed with the assistance of AI coding tools.
+
+To maintain code quality, architectural consistency and a comprehensible project history, a common development workflow is required.
+
+## Decision
+
+The project follows a feature-branch based development workflow.
+
+The `main` branch shall always represent a stable and working state.
+
+Development of new functionality shall take place on dedicated feature branches.
+
+Examples:
+
+- feature/domain-model
+- feature/storage
+- feature/import
+- feature/transcription
+- feature/diarization
+- feature/export
+- feature/ui
+
+Feature branches shall be merged into `main` only after:
+
+- implementation is complete
+- documentation has been updated where required
+- all tests pass
+- static analysis completes without errors
+
+Architectural changes shall be documented using Architecture Decision Records (ADRs).
+
+Project versioning follows Semantic Versioning.
+
+Version numbers shall be maintained in:
+
+- `pyproject.toml`
+- `CHANGELOG.md`
+
+Each released version shall be tagged in Git.
+
+
+## Consequences
+
+- Development history remains easy to understand.
+- Experimental work is isolated from the stable branch.
+- Architectural decisions remain documented.
+- Releases are reproducible through Git tags.