# Track state for metadata_field_cache_20260624
# Child 3 of metadata_ssdl_defusing_20260624 campaign.
# 3 phases, 3 tasks. BLOCKED_BY children 1 and 2.

[meta]
track_id = "metadata_field_cache_20260624"
name = "Child 3: Metadata Field Cache"
status = "cancelled"
# Never started. Same reason as metadata_generational_handle_20260624.
# The 4.01e22 combinatoric explosion is from dict[str, Any] type-dispatch, not from
# missing field caches. Type promotion (code_path_audit_phase_2_20260624) eliminates
# the 123 entry.get('key', default) sites; a field cache would be redundant.
cancellation_reason = "Premise was wrong; type promotion eliminates the dispatch branches the cache would optimize."
current_phase = 0
last_updated = "2026-06-24"

[parent]
parent_campaign = "metadata_ssdl_defusing_20260624"

[blocked_by]
code_path_audit_20260607 = "shipped"
metadata_nil_sentinel_20260624 = "shipped"
metadata_generational_handle_20260624 = "shipped"

[blocks]
# This child blocks nothing within the campaign (it's the last child)

[phases]
phase_1 = { status = "pending", checkpointsha = "", name = "Behavioral Test" }
phase_2 = { status = "pending", checkpointsha = "", name = "Implementation (Cache + 123 migrations)" }
phase_3 = { status = "pending", checkpointsha = "", name = "Verification + Budget Gate + Campaign SHIPPED" }

[tasks]
t1_1 = { status = "pending", commit_sha = "", description = "Write tests/test_metadata_field_cache.py with 4 tests (red)" }
t2_1 = { status = "pending", commit_sha = "", description = "Add MetadataFieldCache + migrate 123 field-access sites" }
t3_1 = { status = "pending", commit_sha = "", description = "Run all 6 VCs; capture budget gate; write child TRACK_COMPLETION; write campaign TRACK_COMPLETION; update both state.toml + tracks.md" }

[verification]
vc1_field_cache_exists = false
vc2_production_uses_cache = false
vc3_behavioral_test_passes = false
vc4_budget_gate_met = false
vc5_full_test_suite_green = false
vc6_audit_gates_clean = false

[budget_gate]
baseline = "post_child_2_measurement"
expected_drop_pct = 30
post_child_3_measurement = null