Create implementation plan generation framework
generate_plans.md: Master plan defining 10 phases (0, 1, 2, 3A, 3B, 3C, 4-8)
with component assignments, sub-tasks, testable outcomes, and HighLevelReqs
coverage. Phase 3 split into 3A (runtime foundation + failover), 3B (site I/O
+ observability), 3C (deployment pipeline + S&F) per Codex review. Failover
testing embedded in runtime phases, not deferred to hardening.
requirements-traceability.md: Full matrix mapping all 54 HighLevelReqs sections
and 22 REQ-* identifiers to implementation phases. Zero unmapped requirements.
questions.md: 15 open questions requiring follow-up before/during implementation
(tooling, environments, team, integration targets).
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