# ADR 008 — Complete Phase 0 Before Detailed Build Planning

**Status:** Accepted

## Decision

The project will complete repository research, validation, architecture selection, and critical prototypes before writing the detailed production implementation milestone plan.

## Context

Multiple candidate open-source projects already implement overlapping parts of the desired system. The correct build sequence depends heavily on which codebase is selected.

## Alternatives Considered

- write full implementation plan immediately,
- begin coding against the first plausible project,
- perform a bounded Phase 0 and then finalize the build plan.

## Reason

The third approach reduces speculative planning and prevents large amounts of rework.

## Consequences

- `BUILD-MILESTONES.md` remains intentionally high level during Phase 0,
- production coding should not begin unless explicitly authorized,
- Phase 0 ends with the final build plan.