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The timestep as a transaction: model.step and a run transcript you can watch, publish and read back - #716

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lmoresi merged 15 commits into

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docs/timestepping-pattern

Sep 23, 2026

Merged

The timestep as a transaction: model.step and a run transcript you can watch, publish and read back#716
lmoresi merged 15 commits into
developmentfrom
docs/timestepping-pattern

Commits on Sep 15, 2026
- docs: the timestepping pattern — the clock lives on model.tracker, units are chosen before the mesh
  
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- feat: model.step(dt) — the timestep as a transaction, with an ordered record of what it did
  
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- feat: a run keeps the state each step started from, writes its log to disk, and draws it
  
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- feat: the transcript — what a run did, judged by a later pass rather than in the loop, and left by default
  
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- feat: solvers describe what they solve, the transcript records how each solve went, and the figure marks it
  
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- fix: what using the record turned up — two histories on one field, swarm advection, one solve one event, the warnings shim
  
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- feat: the transcript reads as the user wrote the model, with a key to what each part solves
  
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- feat: the figure's key sets each quantity as mathematics
  
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- feat: the path within a step is stepped, not sloped
  
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- feat: the figure's key sets each part's residual forms as equations
  
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- fix: exact constants in the transport scheme's form
  
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- Move the run-transcript blog post to the blog branch
  
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Commits on Sep 17, 2026
- Merge development: keep the trim, keep both swarm features, drop the doubled band
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Commits on Sep 22, 2026
- Charter S4: state the sanctioned failure mode at four except-pass sites
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Commits on Sep 23, 2026
- Merge development: take the reviewed expression fix, drop scratch transcripts
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