Migrate project artifacts to spec-kit format

- Move cross-cutting docs (personas, design system, implementation phases,
  Ideen.md) to .specify/memory/
- Move cross-cutting research and plans to .specify/memory/research/ and
  .specify/memory/plans/
- Extract 5 setup tasks from spec/setup-tasks.md into individual
  specs/001-005/spec.md files with spec-kit template format
- Extract 20 user stories from spec/userstories.md into individual
  specs/006-026/spec.md files with spec-kit template format
- Relocate feature-specific research and plan docs into specs/[feature]/
- Add spec-kit constitution, templates, scripts, and slash commands
- Slim down CLAUDE.md to Claude-Code-specific config, delegate principles
  to .specify/memory/constitution.md
- Update ralph.sh with stream-json output and per-iteration logging
- Delete old spec/ and docs/agents/ directories
- Gitignore Ralph iteration JSONL logs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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<!--
Sync Impact Report
==================
Version change: 0.0.0 (template) -> 1.0.0
Modified principles: N/A (initial adoption)
Added sections:
- 6 Core Principles (Privacy, Methodology, API-First, Quality, Dependencies, Accessibility)
- Tech Stack & Constraints
- Development Workflow
- Governance
Removed sections: N/A
Templates requiring updates:
- .specify/templates/plan-template.md: OK (Constitution Check section already generic)
- .specify/templates/spec-template.md: OK (no constitution-specific references)
- .specify/templates/tasks-template.md: OK (no constitution-specific references)
- .specify/templates/checklist-template.md: OK (no constitution-specific references)
- .specify/templates/commands/*.md: N/A (no command files exist)
Follow-up TODOs: none
-->
# fete Constitution
## Core Principles
### I. Privacy by Design
Privacy is a design constraint, not a feature. It shapes every decision from
the start.
- The system MUST NOT include analytics, telemetry, or tracking of any kind.
- The server MUST NOT log PII or IP addresses.
- Every feature MUST critically evaluate what data is necessary; only data
absolutely required for functionality may be stored.
- External dependencies that phone home (CDNs, Google Fonts, tracking-capable
libraries) MUST NOT be used.
### II. Test-Driven Methodology
Development follows a strict Research -> Spec -> Test -> Implement -> Review
sequence. No shortcuts.
- Tests MUST be written before implementation (TDD). The Red -> Green ->
Refactor cycle is strictly enforced.
- No implementation code may be written without a specification.
- E2E tests are mandatory for every frontend user story.
- When a setup task or user story is completed, its acceptance criteria MUST
be checked off in the corresponding spec file before committing.
### III. API-First Development
The OpenAPI spec (`backend/src/main/resources/openapi/api.yaml`) is the
single source of truth for the REST API contract.
- Endpoints and schemas MUST be defined in the spec first.
- Backend interfaces and frontend types MUST be generated from the spec
before writing implementation code.
- Response schemas MUST include `example:` fields for mock generation and
documentation.
### IV. Simplicity & Quality
KISS and grugbrain. Engineer it properly, but do not over-engineer.
- No workarounds. Always fix the root cause, even if it takes longer.
- Technical debt MUST be addressed immediately; it MUST NOT accumulate.
- Refactoring is permitted freely as long as it does not alter the
fundamental architecture.
- Every line of code MUST be intentional and traceable to a requirement.
No vibe coding.
### V. Dependency Discipline
Every dependency is a deliberate, justified decision.
- A dependency MUST provide substantial value and a significant portion of
its features MUST actually be used.
- Dependencies MUST be actively maintained and open source (copyleft is
acceptable under GPL).
- Dependencies that phone home or compromise user privacy MUST NOT be
introduced.
### VI. Accessibility
Accessibility is a baseline requirement, not an afterthought.
- All frontend components MUST meet WCAG AA contrast requirements.
- Semantic HTML and ARIA attributes MUST be used where appropriate.
- The UI MUST be operable via keyboard navigation.
## Tech Stack & Constraints
- **Backend:** Java 25 (LTS, SDKMAN), Spring Boot 3.5.x, Maven with wrapper
- **Frontend:** Vue 3, TypeScript, Vue Router, Vite, Vitest, ESLint, Prettier
- **Testing:** Playwright + MSW for E2E, Vitest for unit tests, JUnit for
backend
- **Architecture:** Hexagonal (single Maven module, package-level separation),
base package `de.fete`
- **State management:** Composition API (`ref`/`reactive`) + localStorage;
no Pinia
- **Database:** No JPA until setup task T-4 is reached
- **Design system:** Electric Dusk + Sora (see `.specify/memory/design-system.md`)
- **Deployment:** Dockerfile provided; docker-compose example in README
## Development Workflow
- Document integrity: when a decision is revised, add an addendum with
rationale. Never rewrite or delete the original decision.
- The visual design system in `.specify/memory/design-system.md` is authoritative. All
frontend implementation MUST follow it.
- Research reports go to `docs/agents/research/`, implementation plans to
`docs/agents/plan/`.
- Conversation and brainstorming in German; code, comments, commits, and
documentation in English.
- Documentation lives in the README. No wiki, no elaborate docs site.
## Governance
This constitution supersedes all ad-hoc practices. It is the authoritative
reference for project principles and constraints.
- **Amendment procedure:** Amendments require documentation of the change,
rationale, and an updated version number. The original text MUST be
preserved via addendum, not overwritten.
- **Versioning:** The constitution follows semantic versioning. MAJOR for
principle removals or redefinitions, MINOR for additions or material
expansions, PATCH for clarifications and wording fixes.
- **Compliance review:** All code changes and architectural decisions MUST
be verified against these principles. The plan template's "Constitution
Check" gate enforces this before implementation begins.
- **Agent governance:** The agent works autonomously on implementation tasks.
Architectural decisions, fundamental design questions, tech stack choices,
and dependency selections MUST be proposed and approved before proceeding.
**Version**: 1.0.0 | **Ratified**: 2026-03-06 | **Last Amended**: 2026-03-06