Create an architecture decision

Prompt file imported from lys-developre/FreeTimers (.github/prompts/create-adr.prompt.md). Copyright stays with the author.

Determine whether the requested choice is cross-cutting, expensive to reverse, or changes a security/privacy boundary. If not, document it near the relevant code or canonical document instead of creating an ADR.

For a valid ADR:

1. Inspect existing ADR numbering.
2. Use docs/architecture/decisions/README.md.
3. Describe context without assuming the decision.
4. Compare credible alternatives.
5. Record the decision and why it fits current requirements.
6. Include consequences, security/privacy impact, and reversal strategy.
7. Link affected canonical documentation.

Do not fabricate benchmarks or claim implementation is complete.