OriginStack 2.14.0

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Learned noise reduction by default for nebulae and star fields, a stretch that finds the
target itself, cleaner multi-night combines, AAVSO light-curve reports, and a way to support
the project.

Changed

• Learned noise reduction is now the automatic choice for nebulae and star fields on
  Celestron Origin data (--auto, the default): --denoiser nn, with colour-noise reduction
  run before it. On five held-out targets this kept star widths within 0.3% and colour
  accuracy equal to the wavelet denoiser's, at 3.5-27x lower sky noise and 3-40x the
  faint-structure contrast. Galaxies keep the learned deconvolver; --denoiser wavelet
  restores the previous behaviour. Without the colour-noise step first, the network had
  widened stars 1-2% on nebula fields.

Added

• Support OriginStack: a link to the project's Ko-fi page in the desktop app's header and
  beside the finished run's buttons, on the website and on GitHub (the Sponsor button). It
  opens in your browser; the app sends nothing.
• --stretch object (also in the app's re-stretch menu): takes the stretch from the target
  itself rather than the whole frame. It finds the object around where the telescope pointed;
  when that object is fainter than the field's white point, the white point comes down to just
  above its core and the curve's contrast moves up to its typical level. A brighter rendering
  of a small or faint galaxy at the cost of a grainier sky (Sculptor, Black Eye); exactly the
  plain ghs stretch on nebulae, clusters and anything that fills the frame.
• --merge-consistency (with --merge or a multi-session combine, opt-in): leaves a night
  out wherever it shows a significant feature the other nights show nothing of, such as a
  satellite glint, an unrejected hot-pixel cluster or a transient; structure every night
  shows keeps the plain weighted mean. On held-out two-night pairs it removed one-night
  100-sigma artefacts in every case, kept faint sources both nights show in full, cut sky
  error by 20% on average and never made the image itself worse; on real merges star widths
  and colour calibration were unchanged.
• AAVSO reports: --aavso-report (with --photometry-timeseries) writes the target's light
  curve in the AAVSO Extended Format for WebObs upload, calibrated on AAVSO's own comparison
  stars (VSP chart) with a check star and optional time bins; tools/aavso_report.py makes
  one from an earlier run. On an Orion Nebula session, comparison stars of V 10-13.6 measured
  against the others came out at TG - V +0.004 +- 0.035 mag.
• tools/bench_vs_siril.py --external STACK.fits scores another stacker's linear colour
  stack (Astro Pixel Processor, DeepSkyStacker, PixInsight, ...) against OriginStack with the
  same shared-star width and matched-noise measurements as the Siril comparison;
  --external-seconds records the time you measured, --reuse-originstack scores several
  stacks against one OriginStack run.