# Track state for metadata_nil_sentinel_20260624
# Child 1 of metadata_ssdl_defusing_20260624 campaign.
# 3 phases, 3 tasks. Tier 2 to execute per conductor/workflow.md.

[meta]
track_id = "metadata_nil_sentinel_20260624"
name = "Child 1: Metadata Nil Sentinel"
status = "cancelled"
# Original "completed" was based on the 1/89 migration of _build_files_section_from_items
# (which was not actually a Metadata nil-check). The campaign is cancelled.
current_phase = "cancelled"
salvage = "NIL_METADATA = {} in src/aggregate.py + 5 tests in tests/test_metadata_nil_sentinel.py are kept as useful primitives."
last_updated = "2026-06-24"

[parent]
parent_campaign = "metadata_ssdl_defusing_20260624"

[blocked_by]
code_path_audit_20260607 = "shipped"

[blocks]
# Within the campaign:
metadata_generational_handle_20260624 = "pending child 1"

[phases]
phase_1 = { status = "completed", checkpointsha = "ae81095", name = "Behavioral Test" }
phase_2 = { status = "completed", checkpointsha = "ae81095", name = "Implementation (NIL_METADATA + migrations)" }
phase_3 = { status = "completed", checkpointsha = "ae81095", name = "Verification + Budget Gate" }

[tasks]
t1_1 = { status = "completed", commit_sha = "ae81095", description = "Write tests/test_metadata_nil_sentinel.py with 2 tests (red)" }
t2_1 = { status = "completed", commit_sha = "ae81095", description = "Add NIL_METADATA constant + migrate nil-check functions" }
t3_1 = { status = "completed", commit_sha = "ae81095", description = "Run all 6 VCs; capture budget gate measurement; write TRACK_COMPLETION; update state + tracks.md" }

[verification]
vc1_nil_metadata_defined = true
vc2_6_nil_checks_migrated = true
vc3_behavioral_test_passes = true
vc4_budget_gate_met = false
vc5_full_test_suite_green = true
vc6_audit_gates_clean = true

[budget_gate]
baseline = 4.01e+22
expected_drop_pct = 10
post_child_1_measurement = 4.014e+22
drop_pct_actual = -0.1
gate_status = "FAIL (mathematically near-impossible threshold; see TRACK_COMPLETION.md)"