realsense: tell the linker where nix actually put librealsense2

[leshy]

dimos run of anything with a RealSenseCamera fails its native build with

rust-lld: error: unable to find library -lrealsense2

[greptile-apps]

Confidence Score: 5/5

Safe to merge: the native build script selects the directory containing librealsense2 and retains its existing fallback behavior.

What we checked:

• Compared the prior Nix-style directory handling with the updated ancestor-directory lookup to verify how the script resolves linker search paths.
• Confirmed that when librealsense2.so exists in /lib, the updated logic emits /lib as both the native linker search path and the runtime rpath.
• Confirmed that when no ancestor contains the library, the script retains the supplied pkg-config path as its fallback.
• Compared the pre-change behavior to the post-change behavior: the library-containing /lib is emitted for both directives and the missing-library fallback remained unchanged.

Summary

• Updates the standalone RealSense build script so Cargo links against the directory that actually contains librealsense2.so when pkg-config reports a Nix-style subdirectory.
• Keeps the reported pkg-config directory as a fallback when the library cannot be located in an ancestor directory.
• Refreshes the standalone RealSense lockfile for the local dimos-module dependency.

No merge-blocking issues found.

_{Reviews (1) · Last reviewed commit: "realsense: tell the linker where nix act..."}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main    #4054      +/-   ##
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- Coverage   78.22%   78.20%   -0.02%     
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  Files        1431     1428       -3     
  Lines      135204   135077     -127     
  Branches    11711    11708       -3     
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- Hits       105762   105643     -119     
+ Misses      26167    26112      -55     
- Partials     3275     3322      +47     

Components	Coverage Δ
Tests	94.71% <ø> (+0.05%)	⬆️

Flag	Coverage Δ
OS-ubuntu-24.04-arm	74.53% <ø> (-0.01%)	⬇️
OS-ubuntu-latest	75.10% <ø> (-0.01%)	⬇️
Py-3.10	75.10% <ø> (-0.01%)	⬇️
Py-3.11	75.09% <ø> (-0.01%)	⬇️
Py-3.12	75.10% <ø> (+<0.01%)	⬆️
Py-3.13	75.09% <ø> (-0.01%)	⬇️
Py-3.14	75.10% <ø> (-0.01%)	⬇️
Py-3.14t	75.10% <ø> (+<0.01%)	⬆️
SelfHosted-Large	30.76% <ø> (-0.04%)	⬇️
SelfHosted-Linux	35.57% <ø> (+<0.01%)	⬆️

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