c97b94376a
Wrote the end-of-track completion report following the precedent set by TRACK_COMPLETION_send_result_to_send_20260616. Documents: - Track overview, type, scope (2 issues, ~11 commits) - Per-commit inventory with phases - The 11/11 tier verification result (~825s total) - Notable decisions (NEVER USE APPDATA compliance, structural test design, Windows rmtree workaround, _pending_focus_response pattern) - Sandbox enforcement contracts (all 8 held) - Pre-existing issues remaining (4 Gemini 503 skip markers, out of scope) - User handoff instructions (fetch, merge, review, verify)