Wormhole Observer Ladder

This note locks the approved wormhole traversal baseline as a six-checkpoint fresh-instance ladder. It uses a mixed strategy:

• an interpolation-friendly near-side leg
• a discovered-checkpoint hard leg on the far side

The ladder remains sparse: no geometry edits, no transport changes, and no continuous traversal.

Derived characterization: Wormhole Observer Ladder Characterization

Near-side baseline run: fixture_011_wormhole_checkpoint_sequence/2026-04-20T18-27-07

Hard-leg discovery confirmation: fixture_013_wormhole_throat_exit_interpolation/2026-04-20T19-52-15

The approved sparse progression is now:

1. mouth
2. mouth_to_throat_approach
3. throat
4. post_throat_backstep_01
5. post_throat_exit_approach
6. exit_lookback

Approved Checkpoints

00 Mouth

• Meaning: near-mouth witness showing the portal boundary and mapped far-side relation.
• Transform: Transform3D(0.890906, 0, 0.454187, 0.062862, 0.990376, -0.123306, -0.449816, 0.138405, 0.882332, -2.35, 1.05, 3.55)
• runVerified = true

01 Mouth-To-Throat Approach

• Meaning: conservative densification of the highest-effort leg between the mouth and throat witnesses.
• Transform: Transform3D(0.907106, 0, 0.420902, 0.059122, 0.990086, -0.127417, -0.416729, 0.140466, 0.898113, -2.085, 0.985, 3.465)
• runVerified = true

02 Throat

• Meaning: throat-positive witness anchored at the validated observer pose.
• Transform: Transform3D(0.922063, 0, 0.387039, 0.055236, 0.989764, -0.131592, -0.383077, 0.142715, 0.912625, -1.82, 0.92, 3.38)
• runVerified = true

03 Post-Throat Backstep 01

• Meaning: discovered hard-leg checkpoint reached by a small backstep from the validated post-throat exit-side anchor. This is not a transform interpolation result.
• Transform: Transform3D(0.931609, 0, -0.363462, -0.052292, 0.989596, -0.134033, 0.35968, 0.143872, 0.921917, 22.2, 0.92, 3.35)
• runVerified = true

04 Post-Throat Exit Approach

• Meaning: first strong far-side post-throat witness that keeps wormhole interaction high.
• Transform: Transform3D(0.931609, 0, -0.363462, -0.052292, 0.989596, -0.134033, 0.35968, 0.143872, 0.921917, 23.4, 0.92, 3.35)
• runVerified = true

05 Exit Look-back

• Meaning: far-side look-back witness confirming the exit-side observer relation.
• Transform: Transform3D(0.931609, 0, -0.363462, -0.052292, 0.989596, -0.134033, 0.35968, 0.143872, 0.921917, 25.65, 0.92, 3.35)
• runVerified = true

Compact Comparison

Checkpoint	portal_hit_pixels	throat_event_pixels	boundary_crossings_total	TotalEmittedRaySegCount	AverageSegmentsPerRay	runVerified
mouth	18969	12559	84174	12903836	99.5666	true
mouth_to_throat_approach	21155	13585	90554	12645509	97.5734	true
throat	22684	14770	96924	12423032	95.8567	true
post_throat_backstep_01	12482	7185	27192	9954012	76.8056	true
post_throat_exit_approach	23313	27351	214410	10787760	83.2389	true
exit_lookback	33148	28487	184026	11219542	86.5705	true

Interpretation

The near-side leg is interpolation-friendly: mouth, mouth_to_throat_approach, and throat rise smoothly in portal, throat, and crossing load while segment cost steps down gradually.

The hard leg is discovery-driven: post_throat_backstep_01 reintroduces valid wormhole interaction without relying on invalid world-space interpolation, then post_throat_exit_approach jumps to the strongest far-side interaction load before settling slightly at exit_lookback.

Transport effort by emitted segment count is still highest at mouth. The strongest wormhole interaction load appears at post_throat_exit_approach, while post_throat_backstep_01 acts as the first stable sparse bridge on the hard leg.

Next Step

The next small step is either:

1. discover one more valid sparse checkpoint between post_throat_backstep_01 and post_throat_exit_approach, or
2. keep interpolation experiments constrained to the approved near-side leg while using discovered checkpoints on the hard leg.