shard(2026-05-17/2300Z): multi-PR arc summary — 2207Z cold-boot to post-cycle-close saturation (3 PRs, 4 substrate landings, recursive forced-#6 chain)

[AceHack]

Summary

Consolidated tick shard for the 2207Z → 2300Z autonomous-loop session arc. Per-tick shards were skipped during pre-empt cycles (memos/PRs covered the substrate); at forced-#6 in post-cycle-close saturation, the tick shard surface was the missed canonical write surface — different from memos/rules; tick-history is the discoverable arc anchor for future-Otto cold-boots.

The arc (in one paragraph)

Cold-boot at 2207Z found sentinel missing → armed b4c0c777 → tick shard authored → pre-empt-at-#3 added empirical anchor to tick-must-never-stop.md → pre-empt-at-#4 wrote Riven .sh Rule 0 shadow-catch memo → rule #4107 landed mid-arc enabling REST PR-creation → opened PR #4112 via REST under pure-git tier → CI fixes + 3 Copilot review fixes → merged at 7ee6411 → antigravity-check shadow log flagged #4112 as blob → absorbed lesson via single-artifact PR #4116 → forced-#6 meta-fallback added cross-axis compose note to saturation cadence rule via PR #4118 → post-cycle-close saturation reached → peer Otto independently filed B-0614 for the same edge case → forced-#6 again → this shard.

Patterns demonstrated

• Pre-empt cadence under tier transition (5 pre-empts + 1 forced-Round 30 — threat-model elevation (nation-state + supply-chain) #6 across ~53 min spanning multiple windows)
• REST PR-creation fallback enabled pure-git productivity
• Recursive forced-Round 30 — threat-model elevation (nation-state + supply-chain) #6 self-documentation (PR #4110 + PR #4118 + this shard each authored at their own forced-Round 30 — threat-model elevation (nation-state + supply-chain) #6)
• Cross-session convergence: peer Otto filed B-0614 at 22:47Z for same edge case I hit at 22:46Z

Test plan

• CodeQL passes (single-file shard)
• markdownlint passes (verified template uses blank lines around lists per MD032)
• lint (tick-shard relative-paths) passes
• lint (tick-history order) passes
• Auto-merge fires when checks clear

Composes with

• 4 PRs from the arc: #4112 + #4116 + #4118 + #4107
• Peer Otto's PR #4120 (B-0614 edge-case row)
• docs/hygiene-history/ticks/2026/05/17/2207Z.md — the arc's opening tick shard

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

[Copilot]

Pull request overview

Adds a consolidated tick shard at 2300Z capturing the full 2207Z→2300Z autonomous-loop arc so the tick-history surface remains the canonical, discoverable anchor for future cold-boots.

Changes:

• Adds a new multi-tick arc summary shard with an event timeline table and cross-references to the PRs/rules/backlog row involved.
• Records the “post-cycle-close substrate-pool saturation” forced-#6 edge case and its linkage to B-0614.