feat!: streaming-only — YAML is the product, linopy demoted to compat/oracle

[FBumann]

What

The repositioning decided in discussion: the streaming engine is the only runtime lane, and the interface is YAML — full stop. linopy leaves the runtime dependency graph and survives in exactly two roles: the opt-in compatibility layer and the differential-test oracle.

1. Native runner (api.py)

import linopy_yaml as ly

sol = ly.solve("model.yaml", sources={"p_max": "p_max.parquet", ...},
               coords={"snapshot": range(8760)}, memory_limit="2GB")
sol.objective
sol.primal("p")   # tidy DataFrame

Three verbs — build / solve / write_lp — that bind data sources (parquet paths, DataFrames, Series) to a YAML model and execute it. Not a modeling API: math is defined in YAML only; the relational IR is documented as internal (a stable IR-construction API may come later).

2. No fallback — strict language boundary

router.py is deleted. Constructs outside the streaming language are load errors naming the construct and its context (tests/test_language_boundary.py, formerly test_router.py). The elegant fallback machinery had become a product smell: two performance profiles and "which lane ran?" confusion.

3. Dependencies flipped

duckdb/pyarrow/highspy are core; linopy+xarray move to the [oracle] extra (included in dev). xarray imports are lazy in helpers, where_parser, and tidy_sources; parquet-path sources pass straight through to the executor.

The guarantee is tested: a subprocess test (test_api.py::test_runtime_is_linopy_free) imports the package, builds, and solves — asserting linopy and xarray never appear in sys.modules.

Breaking change

import linopy_yaml no longer patches linopy.Model. The legacy path is one line away:

import linopy_yaml.compat   # requires: pip install "linopy-yaml[oracle]"
m = Model.from_yaml("model.yaml", data={...})

ARCHITECTURE.md updated in-PR per its own convention (router removed from diagram, compat/oracle lane marked opt-in, new hard rules: linopy-never-runtime, YAML-only interface).

Suite: 135 passed. Follow-ups deferred to issues: streaming-subset completeness audit, solve-API maturation (duals, solver options, Gurobi direct sink).

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e9a9acba-4532-4ddd-a8d5-5618e8652b90

📥 Commits

Reviewing files that changed from the base of the PR and between 9238803 and 57c6e14.

📒 Files selected for processing (19)

• .gitignore
• ARCHITECTURE.md
• docs/relational.md
• linopy_yaml/__init__.py
• linopy_yaml/api.py
• linopy_yaml/compat.py
• linopy_yaml/helpers.py
• linopy_yaml/lowering.py
• linopy_yaml/relational/__init__.py
• linopy_yaml/relational/executor.py
• linopy_yaml/router.py
• linopy_yaml/where_parser.py
• pyproject.toml
• tests/conftest.py
• tests/test_api.py
• tests/test_language_boundary.py
• tests/test_piecewise_block.py
• tests/test_piecewise_convex.py
• tests/test_schema.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/streaming-only

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