KB: #131 miss-means-miss pick semantics + instruments [T2]

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

context/combat-damage.md

@@ -123,6 +123,18 @@ armour-darkening bindings — the same authored patch->zone mapping that already
 panels), segment dzone as the untagged-patch fallback; `ZoneAimPoint` aims hull zones at their
 patch CENTROIDS so the zone walker can exercise per-panel.  Bench: [[test-harness]] §zone-walk
 (madcat variant, scratchpad/night11/zonewalk_madcat.sh).
+**MISS-MEANS-MISS (#131, 2026-08-05) [T2 both-direction bench]:** the pick answers ONLY for
+drawn geometry -- the any-object SPHERE fallback and the caller's whole-mech AABB fallback are
+gone (sphere only for a mesh the reader cannot parse -- none exist, counters clean; AABB only as
+the pre-tree replicant grace, `BTMechSegmentPick` returns 1/0/-1).  They were port stand-ins the
+1995 card never had, and their signature regime was a LEVEL boresight over a SHORT mech: the
+blackhawk's mesh tops out below eye-ray height, so rays cleared every triangle while threading
+the fat cull spheres -- lock ring lit with the reticle above its head (night-12 field report,
+operator-witnessed on the sweep bench).  Instruments: `BT_LOCK_SWEEP` (torso-pan lock envelope,
+operator-watchable), `BT_LOCK_ENVELOPE` (synthetic unit sweep), `[picksrc]`/`[pickbox]` source
+telemetry + objs/invFail/noTri localization.  Locking is now strictly TIGHTER than 716-774; if
+era testers report the pods were more forgiving, Draco's "slight lock linger" memory is the
+sourced follow-up (tracked on #131).
 **TWIST-SIGN VERIFIED (2026-08-04) [T2 live]:** the frame adapter's inferred angular flip
 (`SelectSlice: theta -= TorsoHeading()`, vs the binary's `+=` before the z-reflection) is
 CORRECT — bench: target torso pinned 0/+140°/−140° (`BT_FORCE_TWIST`, sim-level