docs(archive): preserve PR discussions 3220, 3219, 3218

docs/pr-discussions/PR-3218-shard-tick-2001z-minimal-shard-pattern-real-dependency-wait.md

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+---
+pr_number: 3218
+title: "shard(tick): 2001Z \u2014 minimal-shard pattern; real-dependency-wait on #3217"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-14T20:03:40Z"
+merged_at: "2026-05-14T20:06:17Z"
+closed_at: "2026-05-14T20:06:17Z"
+head_ref: "shard/tick-2001Z-minimal-wait-otto-cli-2026-05-14"
+base_ref: "main"
+archived_at: "2026-05-14T20:25:06Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #3218: shard(tick): 2001Z — minimal-shard pattern; real-dependency-wait on #3217
+
+## PR description
+
+Minimum-viable per-tick substrate at session close. Names real-dependency-wait on PR #3217 + documents the minimal-shard pattern (per-tick discipline preserved without churn).
+
+🤖 Generated with [Claude Code](https://claude.com/claude-code)
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-14T20:04:42Z)
+
+## Pull request overview
+
+Adds a single tick-history shard documenting a minimal session-close tick that names PR #3217 as a real dependency and articulates the "minimal-shard pattern" for valid small ticks at session close.
+
+**Changes:**
+- New tick file under `docs/hygiene-history/ticks/2026/05/14/` recording rate-limit, holding discipline, and minimal-scope rationale.
+- Documents the minimal-shard pattern as a valid tick shape distinct from Standing-by-failure-mode.

docs/pr-discussions/PR-3219-shard-tick-2015z-substrate-sanity-check-on-main-standing-by.md

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+---
+pr_number: 3219
+title: "shard(tick): 2015Z \u2014 substrate sanity-check on main (Standing-by self-correction)"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-14T20:17:02Z"
+merged_at: "2026-05-14T20:18:25Z"
+closed_at: "2026-05-14T20:18:25Z"
+head_ref: "shard/tick-2015Z-sanity-check-substrate-otto-cli-2026-05-14"
+base_ref: "main"
+archived_at: "2026-05-14T20:25:06Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #3219: shard(tick): 2015Z — substrate sanity-check on main (Standing-by self-correction)
+
+## PR description
+
+Sanity-check that all audit infrastructure (PRs #3202, #3208, #3212) works end-to-end on main. **23 tests pass / 46 `expect` calls**. Tools produce expected output. GHA workflow YAML parses.
+
+**Notable**: MEMORY.md bloat is slightly reversing organically — 67KB→62.6KB despite adding 3 entries (likely Aaron's day-close work editing entries shorter).
+
+**Substrate-honesty note**: this tick caught my own consecutive-minimal-acknowledgment pattern from prior 5 ticks, which IS the Standing-by failure mode `holding-without-named-dependency-is-standing-by-failure.md` explicitly warns against. Self-corrected by picking a substantive work option from the rule's own list.
+
+🤖 Generated with [Claude Code](https://claude.com/claude-code)
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-14T20:18:16Z)
+
+## Pull request overview
+
+This PR adds a single hygiene-history tick log documenting a substrate sanity-check performed on `main` to verify the audit infrastructure landed in PRs #3202, #3208, and #3212 works end-to-end. The tick also records a self-correction against the Standing-by failure-mode rule and notes that MEMORY.md byte-size is trending down organically.
+
+**Changes:**
+- Adds a new tick-history markdown file under `docs/hygiene-history/ticks/2026/05/14/` recording results of the sanity-check (23 tests / 46 `expect` calls passing, tool outputs, and MEMORY.md trend table).

docs/pr-discussions/PR-3220-shard-tick-2018z-39-candidate-manual-triage-via-9-variant-ta.md

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+---
+pr_number: 3220
+title: "shard(tick): 2018Z \u2014 39-candidate manual triage via 9-variant taxonomy"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-14T20:20:33Z"
+merged_at: "2026-05-14T20:22:17Z"
+closed_at: "2026-05-14T20:22:18Z"
+head_ref: "shard/tick-2018Z-39-candidate-triage-otto-cli-2026-05-14"
+base_ref: "main"
+archived_at: "2026-05-14T20:25:06Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #3220: shard(tick): 2018Z — 39-candidate manual triage via 9-variant taxonomy
+
+## PR description
+
+Ran the audit-rule-cross-refs tool ([PR #3202](https://github.com/Lucent-Financial-Group/Zeta/pull/3202)) + applied the 9-variant taxonomy manually to all 39 candidates.
+
+**Result**: 37 healthy variants + 2 entries pointing at the 1 real defect ([B-0514](docs/backlog/P3/B-0514-author-missing-wwjd-grey-honest-memory-file-2026-05-14.md), already captured).
+
+**False-positive rate**: 38/39 = 97% — Layer A is high-recall + low-precision; Layer B semantic classification is genuinely load-bearing. The 9-variant taxonomy was the right artifact.
+
+Bonus: Layer B heuristics for each variant (LLM-or-regex tractable) noted in the shard's "Notes for future-Otto" section.
+
+🤖 Generated with [Claude Code](https://claude.com/claude-code)
+EOF
+)
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-14T20:23:08Z)
+
+## Pull request overview
+
+Adds a new hygiene-history tick shard documenting the manual triage of `audit-rule-cross-refs.ts` output using the established 9-variant taxonomy, including counts and “future mechanization” heuristics.
+
+**Changes:**
+- Add a 2026-05-14 20:18Z tick shard capturing 39-candidate classification results.
+- Record variant-specific heuristics intended to inform a future Layer B mechanization pass.
+
+## Review threads
+
+### Thread 1: docs/hygiene-history/ticks/2026/05/14/2018Z.md:3 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-14T20:23:07Z):
+
+P1: This tick shard starts with an H1 heading, but the tick-shard schema docs/tools expect the first non-empty line to be a 6-column `| ... |` row (docs/hygiene-history/ticks/README.md:51-63; enforced by tools/hygiene/check-tick-history-shard-schema.ts via its first-line `COL1_RE`). In the current form this file will be flagged as schema-invalid if/when that validator is run. Consider adding the canonical schema row as the first line (and keep the narrative sections below), or update the schema/tooling if heading-first is now the intended standard.