[Lash-L]

Add pure cursor and page planners for V1 dynamic map elements, following #1001 and #1005. Track the accepted generation and logical offset, then return explicit decisions for appends, replacements, empty generations, stale or gapped pages, and bounded generation-reset retries. An overlapping path page contributes only its unseen suffix; other element overlaps are rejected.

Port the element-level portion of the existing local planner, with signed/unsigned 32-bit nonce comparisons, the merged result == 0 or count == 0 acceptance rule, and checks that malformed pages cannot advance a cursor. Whole-map orchestration, byte merging, and device polling follow separately.

Also address Allen's #1005 review: explain how incremental updates keep the displayed path and robot position current, and rename the model/test modules to dynamic_map.py and test_dynamic_map.py under their existing V1 directories.

Validation:

• Focused planner/model/block tests: 149 passed.
• Full suite on Python 3.14: 2,067 passed, 53 xfailed, 11 deselected; 99 snapshots passed.
• All pre-commit hooks passed, including Ruff, Mypy, and Codespell.
• Replayed four saved response cases: path overlap, pose-only path, empty element, and element-generation mismatch. Input captures remained unchanged; capture contents are not included in this PR.

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[codecov]

Codecov Report

❌ Patch coverage is 98.73418% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
roborock/map/dynamic_state.py	97.05%	3 Missing and 3 partials ⚠️

Files with missing lines	Coverage Δ
roborock/data/v1/__init__.py	100.00% <100.00%> (ø)
roborock/data/v1/dynamic_map.py	100.00% <ø> (ø)
tests/data/v1/test_dynamic_map.py	100.00% <ø> (ø)
tests/map/test_dynamic_state.py	100.00% <100.00%> (ø)
roborock/map/dynamic_state.py	97.05% <97.05%> (ø)

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[allenporter]

whats the key?