fix(physics): AD-66 relands — the push-out uses retail's bare radius; plant-then-lift complete (#341 closed)

Third attempt, landed on evidence where the first two correctly refused:
the ten-run stability gate passed 10/10 bit-identical (0x42667451, two
clean-room cycles among the runs), the recalibrated golden's every value
measured with derivations rather than guessed, and the historical
measurement flip stands recorded as unexplained-but-unreproducible
after 37 hunt runs plus these 10 found no divergence anywhere.

The mechanism, completing the S4b byte-pin: validate_walkable plants
the sphere at perpendicular r*N.z (byte-faithful, untouched); this push
fires once per settle and lifts to tangent equilibrium dist=r, where
the trigger goes quiet — retail's slope hover, arriving via the push
exactly as the original substitution's own comment predicted retail
had. Sabotage: restoring radius*N.z reddens the discriminating
exact-value test verbatim. AD-65 conformance, the uphill no-flap
guard, and the #331 absorb pin all green untouched.

AD-66 retired (the campaign's last withheld row); AD-69's seam-frame
correction deliberately unbundled, stays active as its own follow-up.
Clean-room suite 11,267 / 4 / 0 — the suite's two AD-66 skips are gone.

User's "port the retail pair" decision is now fully executed; the
hover-look slope gate is the remaining acceptance.

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

docs/ISSUES.md

@@ -358,7 +358,14 @@ formally still active. Fix belongs with the #339 remediation session.
 
 ---
 
-## #341 — AD-66's landing is blocked by an unexplained measurement flip on the #331 absorb scenario
+## #341 — AD-66's landing is blocked by an unexplained measurement flip — CLOSED 2026-08-08: relanded under its gate, 10/10 bit-identical
+
+**The third reland passed the ten-run stability gate 10/10 bit-identical
+(0x42667451), with the recalibrated golden's every value measured and
+derived, sabotage discriminating, and the clean-room suite 11,267/4/0 (the
+two AD-66 skips retired).** AD-66's register row is retired; the historical
+flip stands recorded as unexplained-but-unreproducible. AD-69 remains the
+one follow-up in that block. Pending: the user's hover-look slope gate.
 
 **Status:** OPEN — HIGH priority for the next physics session; the fix itself
 is byte-proven, the BLOCKER is that the measurement chain contradicted itself.