[Jpatching]

Part of #76. Includes the Slice 1 commit (51372c7), which was only ever on a local main.

Summary

Riding now needs floor agreement: GTA's ground under the rider must belong to the floor the coverage window describes. Previously it had to match the triangles within 0.05 m. Decision record: ADR 0004, new "Floor agreement" section.

 riding tick
   ground = GET_GROUND_Z(rider + 2)
-  |ground - surface| > 0.05 m           -> stop "surface-input-time-unavailable"
+  |ground - surface| > WALL_THRESHOLD   -> stop "floor-agreement-lost"   # 0.3 m, every surface
 mount preparation
   |ground - ground at F6| > 0.05 m      -> refuse   # unchanged: compares GTA ground with itself

combine_skate.js   surfaceObservation()       JS tolerance  = WALL_THRESHOLD
connection.rs      Surface::observation()     Rust tolerance = FLOOR_AGREEMENT (0.3)
GLOSSARY.md        + Floor agreement
AGENTS.md          + cut new branches from a freshly fetched origin/main  (separate commit)

Evidence

• Before: two 2 m samples drawn as one straight triangle miss real ground by more than 0.05 m. With the old check, ordinary streets would end rides:

  coverage-window: rolling R=8.1 m keeps floor agreement   FAIL (error 0.079 m > 0.05)
  rust: observation(ground = surface + 0.29) passes        FAIL
  script: planter between samples -> "floor-agreement-lost" FAIL (no such reason)
  

  After: python3 scripts/verify.py passes:

  REPORT: interpolation error: R=25.9m 0.037; R=16.2m 0.039; R=8.1m 0.079; R=6.1m 0.110; curb 0.25m 0.125
  PASS: curved ground and curbs keep floor agreement; a planter between samples loses it
  PASS: riding onto a planter between samples loses floor agreement on sampled and authored floors and restores GTA
  test floor_agreement_allows_sampling_error_up_to_the_wall_threshold ... ok   (±0.29 pass, ±0.31 fail)
  PASS: repository gate.
  

• In-game run: none yet. The owner's in-game check of Slice 1: Mount on a sampled slope through a Coverage window module #76 (slope ride, wall refusal) is still to come, and ADR 0004 stays proposed until then.

Merge Danger

Door: two-way

The change is a tolerance constant on each side plus one dismount reason. Reverting restores the 0.05 m check.

Blast Radius: riding

It affects only when an active ride dismounts. A ride can now continue with a different floor up to 0.3 m away under the rider, such as a low planter. Curbs ride as ramps, so near one the ped can be drawn up to the step height off GTA ground (a known limitation in ADR 0004). Mounting, coverage gaps and authored-surface refresh are unchanged.

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