fix(mobile): export complete landmark coordinate pairs from EKF

[Afloat16]

Summary

EKF.get_map() uses a landmark's first-observation ordinal as its coordinate offset. After the first landmark, exported rows combine coordinates from adjacent landmarks. For example, a learned map [(-3, 8), (7, -4), (2, 3)] is returned as [(-3, 8), (8, 7), (7, -4)] in both mapping and SLAM.

Reuse landmark_x() to obtain each coordinate pair with the existing complete-state indexing, while preserving first-observation order and a separate returned array. Add end-to-end noiseless mapping and SLAM regressions, including nonzero initial pose, different map layouts, empty and single-observation controls, and returned-array independence.

Validation

• Exact base: 968ed048639c01c9032e256565731e2703de77fe.
• Corrected regressions on the base: 4 failed, 8 passed. Individual landmark estimates and the first exported row are correct controls.
• Focused mobile and EKF tests: 29 passed.
• Complete configured native suite with Swift, collision and QP dependencies: 856 passed, 3 existing explicit skips, 17 subtests passed on Linux/Python 3.12.14. Both compiled extensions are present.
• Ruff formatting, the new test's lint, and git diff --check pass. The existing EKF source diagnostics decrease from 8 to 7, with no new diagnostics.
• The configured Sphinx HTML build succeeds and prints the same 21 existing runblock errors at the same four locations as the base. Those examples are not claimed as passing.
• Other operating systems, Python versions, physical hardware and browser/Pyodide execution were not tested locally.

Checklist

• PR title follows Conventional Commits
• Tests pass locally (pytest), with the existing skips listed above
• Added tests for this change
• Changed method and new test use modern type hints
• Docstring updated
• Change is focused
• No project-specific data or notebooks added

AI assistance: prepared with OpenAI Codex (gpt-6.1-sol). The validation above was executed in the native environment.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 11 complexity · 0 duplication

Metric	Results
Complexity	11
Duplication	0

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