Add initial planning files from ChatGPT research here

planning/DECISIONS/008-phase0-before-build-plan.md

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+# 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.