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Harden the orbfit C library: sanitizer CI, precision, leaks, error handling - #26

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ijiraq:cursor/c-code-hardening

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Harden the orbfit C library: sanitizer CI, precision, leaks, error handling#26
ijiraq wants to merge 7 commits into
OSSOS:masterfrom
ijiraq:cursor/c-code-hardening

Commits on Oct 6, 2026
- Add sanitizer CI job, standalone C driver and o3o08 regression test.
  
  ijiraq
  and
  cursoragent
  committed
  3bd2cab
- Build cleanly as C23: ANSI nrutil, include guards, no hidden warnings.
  
  ijiraq
  and
  cursoragent
  committed
  00451a8
- Parse RA/Dec in double precision and write .abg files at full precision.
  
  ijiraq
  and
  cursoragent
  committed
  9a53a44
- Fix memory leaks and undefined behaviour in the C library.
  
  ijiraq
  and
  cursoragent
  committed
  2441307
- Report library errors to Python instead of exiting; serialize calls
  
  ijiraq
  and
  cursoragent
  committed
  66f2ba4
- Export only the public entry points of the shared library
  
  ijiraq
  and
  cursoragent
  committed
  7746ce0
- Compare the loaded and fitted o3o08 orbits to 1e-10 instead of exactly
  
  ijiraq
  and
  cursoragent
  committed
  d4b4939