hygiene(tick-history): shard 2330Z — schema-check tool landed in DORMANT mode

[AceHack]

Summary

Tick-history shard for autonomous-loop heartbeat at 2026-04-30T23:30Z. Schema-compliant col1 (verified by the new tool itself).

Tick window

• tooling(hygiene): check-tick-history-shard-schema.sh — catch col1 drift at write-time #975 (armed) — tools/hygiene/check-tick-history-shard-schema.sh schema validator landed in DORMANT mode

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds the 2026-04-30T23:30Z tick-history shard, recording the loop heartbeat and noting that the per-shard schema-check tool (PR #975) landed in DORMANT mode.

Changes:

• Add a new tick-history shard file for 2330Z under docs/hygiene-history/ticks/2026/04/30/.
• Record the tick’s action summary and observation for this window.

[Copilot]

The shard row includes literal | characters inside the body cell (in the inline code that shows the required prefix). In Markdown tables, unescaped pipes are treated as cell separators, so this row will render/parse as having extra columns and can violate the 6-column shard schema. Reword that snippet to avoid raw | in the body cell, or escape the pipes (e.g., as \|) so the row remains a valid single-table row.

Suggested change

| 2026-04-30T23:30:00Z | opus-4-7 / session continuation | 1d1f226 | Generative-tooling tick. Built tools/hygiene/check-tick-history-shard-schema.sh — write-time schema validator for per-tick shards. Catches the col1 parenthetical drift that propagated across 15+ shards over 3 days before Copilot caught it. Three rules enforced: (1) filename matches HHMMZ.md or HHMMSSZ-<hash>.md per schema; (2) first line opens with `| YYYY-MM-DDTHH:MM(:SS)?Z |` exactly (both ISO forms accepted); (3) col1 timestamp date + HH:MM matches filename path. Lands in DORMANT mode (not yet wired into CI/pre-push) because 5 April-28 shards on main still violate it AND those 5 are implicated in the prefab finding (#973) — mechanical fix would launder the body-level prefab claim. Will go binding after prefab-vs-schema decision lands. Composes with B-0114 sub-item 1 (pre-push lint hook) + #969 rediscoverable-from-main invariant. PR #975 armed. | #975 (armed) | Observation — this is the structural-fix-beats-process-discipline pattern (Otto-341) applied to the tick-history surface. Two days ago the col1 violation propagated via copy-from-prior-shard because each tick author looked at the most recent shard, copied the format, and inherited the defect. The check makes the propagation visible at write-time. The DORMANT-mode landing is also load-bearing: a binding check that 5 known-good-content shards fail would create CI-bypass pressure (the worst kind of process-vs-substrate trade). Better to land the tool, document the known-stale set, and let the maintainer decide cleanup order. |

| 2026-04-30T23:30:00Z | opus-4-7 / session continuation | 1d1f226 | Generative-tooling tick. Built tools/hygiene/check-tick-history-shard-schema.sh — write-time schema validator for per-tick shards. Catches the col1 parenthetical drift that propagated across 15+ shards over 3 days before Copilot caught it. Three rules enforced: (1) filename matches HHMMZ.md or HHMMSSZ-<hash>.md per schema; (2) first line opens with `\| YYYY-MM-DDTHH:MM(:SS)?Z \|` exactly (both ISO forms accepted); (3) col1 timestamp date + HH:MM matches filename path. Lands in DORMANT mode (not yet wired into CI/pre-push) because 5 April-28 shards on main still violate it AND those 5 are implicated in the prefab finding (#973) — mechanical fix would launder the body-level prefab claim. Will go binding after prefab-vs-schema decision lands. Composes with B-0114 sub-item 1 (pre-push lint hook) + #969 rediscoverable-from-main invariant. PR #975 armed. | #975 (armed) | Observation — this is the structural-fix-beats-process-discipline pattern (Otto-341) applied to the tick-history surface. Two days ago the col1 violation propagated via copy-from-prior-shard because each tick author looked at the most recent shard, copied the format, and inherited the defect. The check makes the propagation visible at write-time. The DORMANT-mode landing is also load-bearing: a binding check that 5 known-good-content shards fail would create CI-bypass pressure (the worst kind of process-vs-substrate trade). Better to land the tool, document the known-stale set, and let the maintainer decide cleanup order. |