diff --git a/docs/ISSUES.md b/docs/ISSUES.md
index 8c35471c..0730cf3f 100644
--- a/docs/ISSUES.md
+++ b/docs/ISSUES.md
@@ -166,9 +166,27 @@ morning: PRE-EXISTING, not a campaign regression.** The pre-campaign binary
 protocol) shows the identical signature — eleven consecutive 2-second windows
 of sustained ~30 m requested with 0.0% yield (`uphill-AB-precampaign.jsonl`).
 Campaign S is exonerated wholesale; the defect is older and was simply never
-noticed before the user's slope attention this week. Suspect space unchanged
-(the UP-normal zero-displacement step-down-refusal shape leads); theory work
-remains forbidden until the mechanism session instruments it.
+noticed before the user's slope attention this week. **MECHANISM CAUGHT 2026-08-08 (`345-mechanism.log`, ACDREAM_DUMP_TRANSIT_FAIL):**
+275 uniform player stuck ticks. Per tick: the run step's target puts the
+sphere's foot point **0.268 m BELOW a too-steep plane** (`N=(0.799,0.050,0.599)`,
+N.z just under FloorZ 0.664); `ValidateWalkable`'s below branch returns
+**Adjusted** (push-up) on EVERY transition attempt — and every attempt reports
+the IDENTICAL `dist=-0.26801`: **the adjustment does not carry forward between
+attempts.** env/building/objects phases all OK each attempt; ~6 attempts per
+tick; attempts exhaust; the transition fails and restores the original
+position. Zero yield. (`oiContact=True, spStepDown=False, guardPassed=False`
+on every line — the morning's `collN=(0,0,1)` comes from the failure path's
+result-filling, not from ValidateWalkable's guard, which never passes here.)
+
+**The fix contract's question is now precise:** what does RETAIL's
+transitional_insert do with validate_walkable's Adjusted on a non-walkable
+plane — does the adjusted CheckPos feed the NEXT attempt (convergence), or
+does retail take a different branch entirely (slide/collision) instead of
+re-adjusting from scratch? Grep-named-first targets:
+`OBJECTINFO::validate_walkable`'s callers, `CTransition::transitional_insert`'s
+attempt loop and its use of the adjusted check position, and the
+`walk_interp` bookkeeping. The non-carry between attempts is the defect
+candidate; do not touch the #331/#32/AD-65 machinery.
 **Filed:** 2026-08-08 morning, from the user's report ("I stop instead of
 sliding") + a directed 45-degree capture.