[boazeggs]

The additional E57 checks found two real interoperability failures in the Riegl fixture:

• Raw Float32 intensity records survived export, but a scalar intensity maximum encoded as ScaledInteger(32767, scale=1/32767) was rewritten without its scale. Its physical value changed from 1.0 to 32767, and PDAL read the first normalised intensity as 0 instead of 8190.
• Replacing the original sensor index bounds with smaller derived bounds changed 873 positions in CloudCompare's last scan, by up to 19.11 m, despite identical raw point records and poses.

Resolve scaled and mixed limit pairs to physical doubles before normalising or writing. Preserve original point records/prototypes, and retain the original sensor grid frame—including absent bounds—in filtered and scan-preserving scene exports. Reuse the existing complete-packet iterator for valid alignment packets in the scene path. Version cached normalised samples only for affected sources; plain-limit E57 cache keys, including the 199M-point BLK2GO fixture, remain unchanged. A changed/invalid source remains a cache miss, with normal reader error handling.

Refs #32 and #42. This follow-up should land with the integration before declaring the E57 acceptance work complete. It builds on #63 at 0962214392f806bdf4c95bcafaecce081bfd2276 (and includes #62/#53). The incremental fix is ff9b5307b84122845c3c443b3d5267878e3f4160; previous review heads remain unchanged. Normal merge commits preserve all earlier PR heads as ancestors.

Validation:

• 1,486 workspace tests passed, 0 failed, 12 ignored, including six new focused regressions for physical intensity, 12-bit RGB/recolouring, mixed types, malformed limits, grid preservation in filtering/scenes and selective cache invalidation. The existing changed-source cache regression also passes.
• Workspace/all-target and minimal-core Clippy pass with warnings denied; Rustfmt, Python syntax and diff checks pass. The shared raw-field validator is an unchanged extraction.
• Actual identity exports of the 471-point / six-photo BLK2GO section and the 1,095,702-point / five-scan / five-photo Riegl source pass pye57/libE57, PDAL 2.10.2 and an E57-enabled CloudCompare build.
• libE57 verifies supported point values/prototypes, physical limits, index bounds, station poses, photo bytes/calibration and remapped associations. Complete PDAL and CloudCompare point text is byte-identical before/after export. Original vendor SHA-256 hashes remain unchanged.

Repeatable probe, package pins, tool hashes and recorded before/after evidence.

These are three external applications sharing the C++ libE57 family, independently of the native Rust decoder; this does not establish three independently implemented external decoders. CloudCompare loads the five spherical photos as ordinary images with an unsupported-camera message; their calibration is verified through libE57. PDAL's exposed intensity/RGB is uint16 and CloudCompare's coordinates are float32, so raw records/schema are checked separately. The broader #32 tracker remains open. Vendor files and reader binaries are not redistributed.

Previously affected exports need regeneration from their original source; the discarded scale cannot safely be inferred from a bad export.