navigation: LingBot-Map geometry runner, keyframe pipeline, live CLI

- geometry.py: GeometryRunner protocol + GeometryOutput contract
  ({points, local_points, conf, camera_poses}); LingBotMapRunner (lazy
  streaming reconstruction, no window stitching); FakeGeometryRunner for
  tests; umeyama_similarity + align_trajectory_to_odometry to anchor the
  monocular scale to Go2 sport-mode odometry (metric map, real m/s A*).
- pipeline.py: viz-free integrate_keyframe (carve → add) + bilinear
  feature upsampling.
- dog_cli.py: LiveMapper (perceive → geometry → features → integrate one
  keyframe, feed the watchdog) + _build_live wiring the real Unitree Go2
  stack (DDS + LingBot-Map + SigLIP2) + `--live` REPL. Lazy throughout, so
  import/--help/dry-run stay model- and SDK-free.
- dog-nav console entry point; README updated.

14 new tests (130 in tests/navigation/), all model/hardware-free.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pyproject.toml

@@ -362,6 +362,7 @@ lerobot-edit-dataset="lerobot.scripts.lerobot_edit_dataset:main"
 lerobot-setup-can="lerobot.scripts.lerobot_setup_can:main"
 lerobot-annotate="lerobot.scripts.lerobot_annotate:main"
 lerobot-rollout="lerobot.scripts.lerobot_rollout:main"
+dog-nav="lerobot.navigation.dog_cli:main"
 
 # ---------------- Tool Configurations ----------------