fix(vendor): the range watcher measures retail's cylinder-gap — the acceptance-band self-close is dead (Fable, from the live trace)

The vendor-verify gate's trace proved the entire walk-to-use chain
succeeding — arrival natural, Use dispatched, UseDone, the full
117-item ApproachVendor — and the panel still never appeared: the
range watcher's plain center-distance shortcut (AP-160) closed the
session the same frame it opened. The walk stops where the server
accepts (cylinder-gap: center minus both radii), which lands ~4.3 m
center against the vendor's authored 3 m — inside the acceptance
band, outside the watcher's bare-center check.

EnforceRange now measures cylinder-gap with both radii resolved
through the SAME ResolveObjectTableHost seam the movement arrival
uses — the seam whose absence was AP-160's original justification,
created by the previous commit's fix. The watcher and the walk agree
by construction. Unresolvable hosts degrade an operand to center
distance (close-early only, never holding a session ACE ended);
heights pass 0 (the host surface exposes radius only). AP-160
narrowed; #352 files the deferred cylinder-vs-center discriminating
unit test (needs a 38-member host fake; the live gate covered the
behavior today).

Clean-room complete solution: 11,536 passed / 4 skipped / 0 failed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/ISSUES.md

@@ -24,6 +24,16 @@ What does NOT go here:
 - Every session: scan OPEN issues at start; promote/close anything we touched during the session before ending.
 - Promoting to a Phase: mark as `DONE (promoted to Phase X)` + commit SHA where the Phase entry landed.
 
+## #352 — Vendor range-watcher cylinder metric: discriminating unit test deferred
+
+**Status:** OPEN (filed 2026-08-08). The EnforceRange cylinder-gap fix
+(acceptance-band self-close, vendor-verify-gate.log evidence) landed with
+the existing 17-range/lifecycle tests green but WITHOUT a unit test that
+discriminates cylinder-vs-center (needs an IPhysicsObjHost fake — 38
+members — bound via BindObjectTableHostResolver; center>radius while
+cylinder<=radius stays open, radii-sabotage closes). Write it next
+session; the live gate covered the behavior.
+
 ## #351 — LandblockBuildOriginTests.FarLoad_StripsEnvCellsAndPhysics flake (Debug, load-sensitive)
 
 **Status:** OPEN (filed 2026-08-08). Seen three times today in Debug runs