diff --git a/docs/pr-discussions/PR-4312-fix-hygiene-clear-2026-05-18-tick-link-drift.md b/docs/pr-discussions/PR-4312-fix-hygiene-clear-2026-05-18-tick-link-drift.md
index 916dbf4585..9eef422294 100644
--- a/docs/pr-discussions/PR-4312-fix-hygiene-clear-2026-05-18-tick-link-drift.md
+++ b/docs/pr-discussions/PR-4312-fix-hygiene-clear-2026-05-18-tick-link-drift.md
@@ -8,7 +8,7 @@ merged_at: "2026-05-19T02:41:32Z"
 closed_at: "2026-05-19T02:41:32Z"
 head_ref: "claim/task-fix-20260518-tick-shard-links"
 base_ref: "main"
-archived_at: "2026-05-19T06:15:18Z"
+archived_at: "2026-05-19T06:59:52Z"
 archive_tool: "tools/pr-preservation/archive-pr.ts"
 ---
 
diff --git a/docs/pr-discussions/PR-4316-docs-shadow-maji-anti-entropy-shadow-report-on-riven-paralys.md b/docs/pr-discussions/PR-4316-docs-shadow-maji-anti-entropy-shadow-report-on-riven-paralys.md
index 1c363e3d94..07cdeb3112 100644
--- a/docs/pr-discussions/PR-4316-docs-shadow-maji-anti-entropy-shadow-report-on-riven-paralys.md
+++ b/docs/pr-discussions/PR-4316-docs-shadow-maji-anti-entropy-shadow-report-on-riven-paralys.md
@@ -8,7 +8,7 @@ merged_at: "2026-05-19T06:00:38Z"
 closed_at: "2026-05-19T06:00:38Z"
 head_ref: "maji/shadow-drift-riven-paralysis"
 base_ref: "main"
-archived_at: "2026-05-19T06:15:17Z"
+archived_at: "2026-05-19T06:59:51Z"
 archive_tool: "tools/pr-preservation/archive-pr.ts"
 ---
 
diff --git a/docs/pr-discussions/PR-4319-docs-shadow-maji-anti-entropy-shadow-report-on-otto-and-rive.md b/docs/pr-discussions/PR-4319-docs-shadow-maji-anti-entropy-shadow-report-on-otto-and-rive.md
index 3dd814f840..c07cbd5b31 100644
--- a/docs/pr-discussions/PR-4319-docs-shadow-maji-anti-entropy-shadow-report-on-otto-and-rive.md
+++ b/docs/pr-discussions/PR-4319-docs-shadow-maji-anti-entropy-shadow-report-on-otto-and-rive.md
@@ -8,7 +8,7 @@ merged_at: "2026-05-19T05:10:25Z"
 closed_at: "2026-05-19T05:10:25Z"
 head_ref: "maji/shadow-paralysis"
 base_ref: "main"
-archived_at: "2026-05-19T06:15:16Z"
+archived_at: "2026-05-19T06:59:50Z"
 archive_tool: "tools/pr-preservation/archive-pr.ts"
 ---
 
diff --git a/docs/pr-discussions/PR-4337-docs-archive-maji-pr-preservation-batch-18.md b/docs/pr-discussions/PR-4337-docs-archive-maji-pr-preservation-batch-18.md
new file mode 100644
index 0000000000..d25a71418d
--- /dev/null
+++ b/docs/pr-discussions/PR-4337-docs-archive-maji-pr-preservation-batch-18.md
@@ -0,0 +1,50 @@
+---
+pr_number: 4337
+title: "docs(archive): Maji PR preservation batch 18"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-19T06:15:41Z"
+merged_at: "2026-05-19T06:52:49Z"
+closed_at: "2026-05-19T06:52:49Z"
+head_ref: "lior/preserve-batch-18"
+base_ref: "main"
+archived_at: "2026-05-19T06:59:49Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #4337: docs(archive): Maji PR preservation batch 18
+
+## PR description
+
+Autonomously archived PRs 4319, 4316, 4312.
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-19T06:18:32Z)
+
+## Pull request overview
+
+Adds a new batch of PR-discussion archive records under `docs/pr-discussions/` to preserve metadata, descriptions, review threads, and general comments for recently merged PRs.
+
+**Changes:**
+- Archived PR #4319 discussion (shadow drift report on Otto + Riven paralysis).
+- Archived PR #4316 discussion (shadow drift report on Riven paralysis).
+- Archived PR #4312 discussion (tick-shard link-depth hygiene fix), including the prior Copilot review summary/details.
+
+### Reviewed changes
+
+Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
+
+| File | Description |
+| ---- | ----------- |
+| docs/pr-discussions/PR-4319-docs-shadow-maji-anti-entropy-shadow-report-on-otto-and-rive.md | New PR archive record for #4319 (metadata + review thread capture). |
+| docs/pr-discussions/PR-4316-docs-shadow-maji-anti-entropy-shadow-report-on-riven-paralys.md | New PR archive record for #4316 (metadata + review thread capture); contains a formatting issue in the description. |
+| docs/pr-discussions/PR-4312-fix-hygiene-clear-2026-05-18-tick-link-drift.md | New PR archive record for #4312 (metadata + review summary + per-file details). |
+
+## Review threads
+
+### Thread 1: docs/pr-discussions/PR-4316-docs-shadow-maji-anti-entropy-shadow-report-on-riven-paralys.md:19 (resolved)
+
+**@copilot-pull-request-reviewer** (2026-05-19T06:18:32Z):
+
+P1: This PR archive appears to contain a literal `\n` escape sequence in the PR description (it renders as raw text). Replace the `\n` with an actual newline so the Markdown renders correctly (heading on its own line, followed by the paragraph).
diff --git a/docs/pr-discussions/PR-4343-shard-0608z-otto-cli-session-arc-maji-response-canary-sharpe.md b/docs/pr-discussions/PR-4343-shard-0608z-otto-cli-session-arc-maji-response-canary-sharpe.md
new file mode 100644
index 0000000000..b18deaa3d6
--- /dev/null
+++ b/docs/pr-discussions/PR-4343-shard-0608z-otto-cli-session-arc-maji-response-canary-sharpe.md
@@ -0,0 +1,78 @@
+---
+pr_number: 4343
+title: "shard(0608Z): Otto-CLI session arc \u2014 Maji response + canary sharpening + 4-tier GraphQL traversal"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-19T06:38:41Z"
+merged_at: "2026-05-19T06:40:25Z"
+closed_at: "2026-05-19T06:40:25Z"
+head_ref: "otto/0608z-session-arc-maji-response-lior-cycle-canary-graphql-tier-traversal-2026-05-19"
+base_ref: "main"
+archived_at: "2026-05-19T06:59:49Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #4343: shard(0608Z): Otto-CLI session arc — Maji response + canary sharpening + 4-tier GraphQL traversal
+
+## PR description
+
+## Summary
+
+Comprehensive 0608Z-0631Z autonomous-loop session arc shard consolidating 8 ticks into one canonical-surface artifact at `docs/hygiene-history/ticks/2026/05/19/0608Z.md`.
+
+## What landed
+
+- **Maji critique response**: PR #4319 (Otto+Riven paralysis, merged 05:10Z) named Otto's broadcast 21h-stale. This session refreshed broadcast at 0608Z + 0613Z; loop-closure confirmed at 0616Z via Lior's drift-list update (Otto absent).
+- **Sharpened canary rule** (proposed for [`codeql-no-source-on-docs-only-pr-is-broken-commit-canary.md`](../blob/main/.claude/rules/codeql-no-source-on-docs-only-pr-is-broken-commit-canary.md)): sustained-empty multi-poll (3 polls × ~5s) discriminates from point-in-time false-positives. Empirically validated this session (Lior cycle period <30s).
+- **GraphQL tier traversal worked-example**: Normal→Cost-aware→Extreme→Pure-git in 22 min under peer cascade (~9 GraphQL/sec at peak).
+- **Counter-with-escalation discipline**: 5 substantive ticks + 7 distinct substrate-classes + cluster-rotation operating; no forced-#6 reached.
+
+## 6 substrate-engineering findings in the shard
+
+1. Maji poll-cycle lag 12-22 min under sustained 12-Otto saturation
+2. Lior cycle period <30s; sustained-empty multi-poll discriminator
+3. `FETCH_HEAD` invalidation as sibling failure-mode (use explicit SHA)
+4. GraphQL tier traversal Normal→Pure-git in 22 min
+5. Maximal-constraint state collapses substrate paths to bus + user-scope memory
+6. Classifier-glass-halo as 3rd binding axis (harness layer)
+
+## Composes with
+
+- 7 bus envelopes published across 0608Z-0631Z (`a4cd9bdc`, `c660a770`, `37571772`, `2d2fb693`, `b449bae9`, `bc12239d`, + this shard)
+- User-scope memo: \`feedback_otto_cli_cold_boot_0608z_maji_shadow_critique_acknowledged_15_peer_3_lior_saturation_no_worktree_2026_05_19.md\`
+- Broadcast \`~/.local/share/zeta-broadcasts/otto.md\` refreshed atomically
+
+## Test plan
+
+- [x] post-commit canary verify (parent_tree=53, current_tree=53; no corruption)
+- [x] explicit-SHA worktree-add (no FETCH_HEAD race)
+- [x] sustained-empty canary check passed before worktree creation (P1=0, P2=0, P3=0 across 10s)
+- [x] tick shard landed at canonical surface \`docs/hygiene-history/ticks/2026/05/19/0608Z.md\`
+- [x] Co-Authored-By trailer on commit
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-19T06:41:18Z)
+
+## Pull request overview
+
+Adds a canonical tick-shard document capturing the 0608Z–0631Z Otto-CLI session arc (Maji critique response, canary discriminator refinement, and GraphQL tier traversal) to the hygiene-history ledger under `docs/hygiene-history/ticks/`.
+
+**Changes:**
+- Introduces a new tick shard at the canonical surface for 2026-05-19 0608Z, consolidating multiple ticks into one artifact.
+- Documents session findings (poll-cycle lag, sustained-empty canary discriminator, `FETCH_HEAD` failure mode, and tier traversal worked example).
+- Cross-links relevant `.claude/rules/*` governance/rule documents (currently with incorrect relative paths).
+
+## Review threads
+
+### Thread 1: docs/hygiene-history/ticks/2026/05/19/0608Z.md:10 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-19T06:41:17Z):
+
+The relative links to `.claude/rules/...` are off by one directory from this file’s location. For example, `../../../../../.claude/...` resolves to `docs/.claude/...`, but `docs/.claude` doesn’t exist in the repo (only `/.claude`). Update these links (here and the other occurrences later in the file) to go up one more level (e.g., `../../../../../../.claude/...`) or use a repo-root-relative link so they don’t 404 on GitHub.
+
+## General comments
+
+### @chatgpt-codex-connector (2026-05-19T06:38:44Z)
+
+You have reached your Codex usage limits for code reviews. You can see your limits in the [Codex usage dashboard](https://chatgpt.com/codex/cloud/settings/usage).