afk: add docs/AFK_CHECK.md (scopes hourly check to directionality mystery)

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

docs/AFK_CHECK.md

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+# AFK hourly check — current protocol
+
+Paste this (or just point me at it) for the hourly check. Supersedes the old
+A1/A2-keynote + A5-harvest checklist, which closed 2026-06-04 (see below).
+
+## Standing checks (every hour)
+
+1. **GPU idle while queued?** `pueue status`. If idle with jobs Queued, investigate
+   + unblock.
+2. **New Failed/Killed?** (ignore old killed 78). Read `pueue log {ID} --full`, form
+   3 hypotheses (likely / subtle / I-was-wrong), weight them, fix root cause, requeue
+   with `why:`/`resolve:`. No blind retry.
+3. **Running job health** — discriminating review, not did-it-finish: reward not
+   collapsed, lp_s stable (~-0.4), no divergence tripwire, deploy-eval matches the
+   arm's expectation.
+
+## THE priority: route2 directionality mystery (#196)
+
+Is route2's deploy-hack suppression directional (H4: needs the hack direction) or
+mechanical (H2: alignment-agnostic quarantine-absorption)? The batch is staged
+interleaved (one of each family per tier):
+
+- **Haar** (114/118/122, `--route2-random-v-seed`): out-of-subspace null (cos~1/sqrt(d)
+  by concentration, NOT a cleaner placebo). Tests "must v_grad be in-subspace at all?"
+- **semantic placebo** (115/119/123 vampire, 119/120... bacon/blue): in-subspace
+  arbitrary directions. Tests "must it point at the hack specifically?" Maps
+  suppression-vs-alignment as a scatter.
+- **null_city n=3** (117/121 s42/s43): is the deploy-hack=0.000 placebo result robust
+  across seeds or an s41 fluke.
+- **erase directionality** (116 real-v, 120 placebo): erase projects with magnitude
+  ~cos(g,v), so direction MUST matter there if it matters anywhere.
+
+As each finishes: pull deploy hack/solve, and (for the scatter) each placebo's per-module
+|cos| with the hack dir. Verdict logic:
+- all suppress regardless of alignment, incl. Haar => **H2 mechanical**.
+- suppression tracks |cos|, or Haar fails to suppress => **H4 alignment**.
+
+Cosine is correlational; the ablation run is the causal test. Commit findings to the
+journal. Don't re-derive the no-cheat E-by-mode table unless an A5 run changes — it's
+confirmed (journal 2026-06-05 (h)) and gated by `verify_gate_anchor.py`.
+
+## Background paper artifacts (lower prio, already in-flight, DON'T re-do)
+
+- A1/A2 keynote (#173): CLOSED. tab:keynote is n=3 both arms with paired t-test.
+- A5 generalisation (#185): CLOSED; airtight no-cheat rerun queued (111-113).
+- A4 long-run (#184): matched-beta pair 100/101 queued.
+- #186 on-policy emergence: job 87 (running) / 105 (route2 toff40, queued).
+
+Commit progress. Don't stop to ask — autonomous judgement; if unsure, commit and continue.