chore: upgrade to linopy 0.7.0

[FBumann]

Summary

• Replace the git-commit pin (2d2e851d, 0.6.4.post1.dev80) with the released linopy>=0.7.0. This unblocks PyPI publication — PyPI rejects direct URL deps, so the git pin was the actual blocker, not the alpha version suffix.
• Drop the xarray<2026.4.0 cap — PyPSA/linopy#647 fixes the Dataset-as-data_vars regression in 0.7.0; xarray now resolves to 2026.4.0 locally.
• Silence linopy.EvolvingAPIWarning inside _create_piecewise_constraints so users don't see it on every solve — fluxopt owns the API-stability risk of add_piecewise_formulation and will surface it in its own changelog instead.
• Cosmetic: drop -alpha.0 from initial-version in .release-please-config.json (bootstrap-only field, no functional effect).

Our existing PiecewiseConversion wiring already matches the unified v0.7.0 API (PyPSA/linopy#638) — (expr, breaks) / (expr, breaks, sign) tuples, method="auto"|"sos2"|"incremental"|"lp", active= gate. No code changes needed there.

The release-please manifest (0.0.7-alpha.0) and the 3 - Alpha classifier are intentionally left alone — the next release-please cycle will drop the prerelease suffix on its own now that prerelease/prerelease-type are gone from the config (already done in #163).

Test plan

• uv sync --group dev resolves linopy 0.7.0 + xarray 2026.4.0
• uv run pytest — 469 passed, 227 skipped (full piecewise suite green)
• uv run mypy src/ — clean
• uv run ruff check . — clean
• EvolvingAPIWarning no longer appears in pytest warning summary

🤖 Generated with Claude Code

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR upgrades the project to use linopy 0.7.0+ from its published package instead of a pinned Git reference, loosens the xarray compatibility constraint, and suppresses the EvolvingAPIWarning that the newer linopy emits during piecewise formulation construction.

Changes

linopy Upgrade and Warning Handling

Layer / File(s)	Summary
Dependency Constraints pyproject.toml	linopy dependency changed from a Git pin to linopy>=0.7.0; xarray upper bound removed, keeping only xarray>=2024.1.0.
Warning Suppression src/fluxopt/model.py	Added imports for warnings and EvolvingAPIWarning; wrapped add_piecewise_formulation() call in warnings.catch_warnings() context to suppress the warning during constraint construction.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A linopy tale, from pin to published grace,
No more Git hashes cluttering the space,
With warnings suppressed in a tidy embrace,
Our constraints now build at a measured pace,
A xarray's upper bound fades without trace!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: upgrade to linopy 0.7.0' clearly summarizes the main change of updating the linopy dependency from a git commit pin to version 0.7.0.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description provides a comprehensive summary of changes, technical rationale, and testing verification covering all required aspects of the description template.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/linopy-0.7.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/fluxopt/model.py	97.43% <100.00%> (+0.01%)	⬆️

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