desihub / fastspecfit / 26348915482

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Add fastqso entry point and QSO-fitting plumbing

- Register fastqso CLI entry point in pyproject.toml
- Add fastqso() driver function; thread fastqso=False flag through
  fastspec(), fastspec_one(), continuum_specfit(), and emline_specfit()
- get_output_dtype(): when fastqso=True, swap galaxy SPECPHOT fields
  (VDISP, LOGMSTAR, SFR, AGE, ZZSUN, TAUV, DN4000) for QSO-specific
  fields (PL_SLOPE, PL_AMPLITUDE, FE_VDISP, FE_AMPLITUDE + IVARs)
- write_fastspecfit(): add FASTQSO header keyword; name the emission-line
  extension FASTQSO instead of FASTSPEC in QSO mode
- Templates: expose self.feflux, self.fewave, self.agnflux, self.agnwave
  as instance attributes (previously computed but discarded)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

28 of 37 new or added lines in 3 files covered. (75.68%)

4540 of 6916 relevant lines covered (65.64%)

0.66 hits per line