Remove generated markers and unused URDF/STL source files from robot packages
Removes 134 generated .last_generated thumbnail-cache markers and the unused i2rt_yam URDF source (one .urdf and nine .stl meshes) from the 137 Robot-Body packages. The USD robot does not depend on those source files: its dependency graph resolves before and after removal. Actual thumbnails, USD geometry, materials, licenses, package IDs and versions remain unchanged. Local original source assets are untouched; recoverable copies of every removed file are retained outside the packages and are not uploaded.
Updates affected BOMs, content hashes, package hashes, local WRAPP catalogs, and Package post-validation evidence. All 137 packages pass Package 1.0.0 post-validation and local catalog checks. Three representative installations are verified. All 4,474 remaining files pass the target qa-staging scanner's allowed-extension and first-512-byte content checks locally; the remote upload is verified against their hashes before this PR is marked ready.
This addresses SCAN.004 without disabling or weakening scanner rules. It is not a new Robot-Body profile validation, simulation benchmark, or a claim of full catalog acceptance. Existing unknown licenses and previously noted missing asset-specific validation/benchmark sidecars are unchanged.
After merge, internal GitHub PR #257 (batch 1 of 3) and the saved later-batch links need the new main commit. Nothing is automatically merged.
actually surprised MR failed with _last_generated....