hygiene(tick-history): 2026-05-01T09:44Z — phantom-blocker triple drain

docs/hygiene-history/ticks/2026/05/01/0944Z.md

@@ -0,0 +1 @@
+| 2026-05-01T09:44:00Z | opus-4-7 / autonomous-loop tick | 98fc7424 | Phantom-blocker triple drain — 3 older hygiene-shard PRs (#996, #995, #993) all unblocked this tick with phantom-blocker findings refuted via empirical verification. Each had a different sub-class: (1) **PR #996 (line-prefix display artifact)** — Copilot flagged "starts with `1 ||`"; `head -c 8 \| od -c` showed file starts with literal `\|` byte. Same class as 5+ prior instances this session. (2) **PR #995 (escaped-pipe-misread)** — Copilot claimed unescaped pipes in body breaking 6-cell schema; empirical pipe-count via `grep -oE "\\\\?\\|"` showed 7 unescaped (table separators) + 4 *backslash-escaped* `\\|` (proper Markdown cell-escape syntax for literal `\|`). The phrase `1 \\|\\| not \\| <ts> \\|` is correctly escaped; GitHub renders it correctly. Copilot read the file as-rendered and concluded the literal `\|` characters were unescaped, missing the backslash escape. **New sub-class: rendered-form-misread / Phantom-blocker**. (3) **PR #993 (hallucinated-content)** — Copilot claimed col-3 was `56af177` (7 chars); `grep -c "56af177"` returned 0 — the string does not appear anywhere in the file. Col-3 is actually `98fc7424` (8 chars, correct format). **New sub-class: hallucinated-content / Phantom-blocker** — reviewer cited a value that doesn't exist in the audited file. All 3 threads resolved via GraphQL with empirical-refutation replies. All 3 PRs hygiene; should auto-merge via host automation on last-thread-resolution. Cron 98fc7424 healthy. | [PR #996 + #995 + #993 — 3 thread-resolutions with empirical-refutation replies; no edits required; auto-merge via host on last-thread-resolution] | The class-level lesson is **phantom-blocker has at least 3 distinct sub-classes**: (a) **line-prefix display artifact** — diff-view line-numbers misread as file content (most common, ~6 instances this session); (b) **rendered-form misread** — reviewer reads rendered output, not source, and flags escaping that's actually present; (c) **hallucinated content** — reviewer cites values absent from the file entirely. Each requires a different verification command: (a) `head -c <N> \| od -c`, (b) `grep -oE "\\\\?\\|"` or other escape-aware regex, (c) `grep -c "<claim>"` showing 0. Future-Otto: when refuting a phantom-blocker, identify the sub-class first; the empirical-verification command depends on it. The pattern catalog promotion to `feedback_pr_thread_resolution_class_taxonomy_v2.md` should sub-divide phantom-blocker into these three classes. The hallucinated-content class is the most concerning because it suggests the LLM reviewer's content-grounding has slipped — worth flagging to the harness team. |