Add terminology clarification and architecture notes:
- joinir-architecture-overview.md:
- Add section 0.1 (routing/fallback/fail-fast terminology)
- Clarify JoinValueSpace vs MIR ValueId distinction
- Add Phase 72 observations (PHI reserved is not architectural)
- Update invariant 12: lexical scope support prerequisite
- phase67-mir-var-identity-survey.md:
- Update with Phase 68/69 status (lexical scope complete)
- Link to ownership analyzer refinements
These are prerequisites for Phase 74 (BindingId infrastructure).
Tests: lib 950/950, normalized_dev 54/54 PASS
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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