Add grid/table cell addressing by row/col

[JE-Chen]

Summary

Round-11, automation-core (locate lane). anchor_locator does pairwise spatial relations but nothing addresses a 2-D grid — "the cell at row 3, column 2" of a table.

Layers

• Headless core: je_auto_control/utils/grid_locator/grid_locator.py — cluster_grid (boxes → rows by centre-y within row_tolerance, cells by centre-x) and locate_cell (centre of the 0-based (row,col) cell). Pure; box enumeration stays the caller's job (no real screen). No PySide6.
• Facade: both re-exported + __all__.
• Executor: AC_grid_cell (JSON boxes + row/col).
• MCP: ac_grid_cell.
• Script Builder: one CommandSpec under Mouse.

Tests / docs

• test/unit_test/headless/test_grid_locator_batch.py — 8 headless tests (cluster rows/cols, cell centre, out-of-range, row_tolerance merge/split, empty + executor round-trip + wiring + facade). Fully pure.
• EN/Zh feature docs v125_features_doc.rst + toctrees; 3 WHATS_NEW entries.

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[codacy-production]

Not up to standards ⛔

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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