f914b2bcd4
Merges 39 commits from tier2 sandbox: - any_type_componentization_20260621 parent (48/89 fat-struct sites; Phases 1,2,4,5 complete; Phase 3 deferred) - phase2_4_5_call_site_completion_20260621 follow-up (Phases 6a broadcast fix + 6b sender migration + 6e Phase 3 cost analysis; Phase 6d was a no-op) - docs/reports/PHASE3_TIER2_ANALYSIS.md (Tier 2 authoritative cost analysis; supersedes Tier 1's draft) Unblocks code_path_audit_20260607: - Phase 6a fixes the broadcast() TypeError that contaminated per-action profiling - Phase 6e provides the cost hypothesis the audit will quantify