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• Typed expression IR

  Replace ad-hoc string/regex/template surgery in `_normalize.py` and `_vectorize.py` with a parse-once typed expression IR. Subsumes the architectural drivers behind #22 (ExpressionString), #5 (NormalizedRhs naming), #30 (helpers as IR macros), #88 (`$`-placeholders / repeated-axis selectors), and #111 (alias-body CSE). Goal: every alias/rate/equation body is parsed once into a small AST (Sym, Subscript[AxisIndex], Apply, Reduce, Literal); all current passes (helper expansion, template substitution, alias inlining, repeated-axis resolution, vectorization) become tree visitors; CSE and constant folding become single IR passes; serialization for cached `CompiledRhs` becomes trivial.

  No due date

  •2/7 issues closed
  28% complete5 open2 closed

• Packaging & Release

  Wheel building, PyPI publishing, clean-room deployment testing, and release infrastructure.

  No due date

  •3/3 issues closed
  100% complete0 open3 closed

• Core Internals

  Compile-layer improvements: meta threading through CompiledRhs, helper serialization, and internal plumbing needed before provider integration.

  No due date

  •3/3 issues closed
  100% complete0 open3 closed

• Provider Integration

  flepimop2 provider package: adapter upgrades, system.option() adoption, operator wiring, and metadata passthrough. Blocked on flepimop2 #131 (SystemABC mixing hook) and #173/#174 (EngineABC hooks).

  No due date

  •8/9 issues closed
  88% complete1 open8 closed

• Axis Masking (Cross-Axis Constraints)

  Add a `constraints` block to the spec schema that filters the Cartesian product of axis coordinates during template expansion. Eliminates empty compartments without manual state splitting. Refs #31.

  No due date

  •2/5 issues closed
  40% complete3 open2 closed

• Pydantic-ify `op_system`'s configuration

  Replaces https://github.com/ACCIDDA/op_system/issues/13 Blocked by https://github.com/ACCIDDA/op_system/pull/14

  No due date

  •3/12 issues closed
  25% complete9 open3 closed