shard(tick): 2112Z — session-arc plateau recognized; brief shards from here

docs/hygiene-history/ticks/2026/05/15/2112Z.md

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+# Tick 2112Z — session-arc plateau recognized; brief shards from here
+
+## Headline
+
+- [PR #3587](https://github.com/Lucent-Financial-Group/Zeta/pull/3587) (2055Z) wait-CI, armed.
+- [PR #3589](https://github.com/Lucent-Financial-Group/Zeta/pull/3589) (2101Z) wait-CI, armed.
+- 28-tick arc; substantive work done; per-tick value-add approaching zero.
+- Cron sentinel `575d1226` live.
+
+## Substrate-honest recognition
+
+Recent ticks (2046Z–2101Z) have been brief/null-actionable shards. Continuing to produce thin-substrate per cron firing risks the no-op-cadence pattern even while technically producing PRs.
+
+This shard explicitly recognizes the plateau and signals: **future ticks in this session arc should be SHORTER unless new work emerges**. The cron will fire; each firing requires a response; the response can be 3-5 lines acknowledging "still wait-CI; cron live; nothing actionable" rather than a full markdown-table audit-survey shard.
+
+Triggering criteria for resumption of substantive shards:
+
+- New peer-Otto / Lior / external activity creating a finding-class
+- Post-merge review thread on one of today's 14+ PRs
+- CI failure requiring investigation
+- Human maintainer message
+
+Until then, ticks are wait-state. Brief shards acknowledge the cron, no more.
+
+## Composes with
+
+- [audit-first-then-decide memory file](../../../../../../memory/feedback_audit_first_then_decide_discipline_pivots_between_fix_row_quiet_otto_cli_2026_05_15.md) — this shard is "null actionable → brief shard"
+- [`.claude/rules/no-op-cadence-failure-mode.md`](../../../../../../.claude/rules/no-op-cadence-failure-mode.md) — explicitly named so future-Otto reading this shard knows the discipline that produced it