Revert PR #687 merge

[jpalm3r]

#687 was merged prematurely, before the follow-up rebases of #681 and #685 onto it were confirmed ready to land. This reverts that merge so main returns to its pre-#687 state; #687 will be re-merged once the full stack is ready.

Reverts commit 8651801.

[ecomodeller]

[Copilot]

Pull request overview

This PR reverts the previously merged PR #687 so main returns to its pre-#687 behavior, primarily by removing the expanded multi-product network constructors/adapters and restoring a simpler Res1D-only network loading path.

Changes:

• Removes EPANET/MIKE 11-specific network constructor logic and companion-file parsing (including deletion of the .inp adapter and related fixtures/ADR).
• Updates docs, notebooks, tests, and roadmap text to reflect Network.from_res1d() and Res1D-only support.
• Adjusts CI workflow checkout action version as part of the revert.

Reviewed changes

Copilot reviewed 14 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/testdata/README.md	Removes fixture provenance documentation introduced with #687.
tests/testdata/epanet.inp	Removes EPANET companion input fixture.
tests/test_network.py	Removes EPANET/MIKE 11/network-extension-policy tests and switches call sites to from_res1d().
tests/notebooks/test_notebooks.py	Updates notebook skip rationale to reference Network.from_res1d().
src/modelskill/network.py	Simplifies Network constructors to from_res1d() and removes multi-format/companion support logic.
src/modelskill/model/network.py	Updates error messaging for Res1D constructor guidance.
src/modelskill/model/adapters/_res1d.py	Removes MIKE 11/EPANET companion-related adapter logic.
src/modelskill/model/adapters/_inp.py	Deletes EPANET/SWMM .inp parser introduced with #687.
roadmap/features/network-models.md	Updates roadmap claims to Res1D-only support.
notebooks/Collection_systems_network.ipynb	Updates example usage to Network.from_res1d().
docs/user-guide/network.qmd	Removes multi-product constructor docs and updates examples to Res1D-only usage.
adr/README.md	Removes ADR-012 reference.
adr/012-network-format-constructors.md	Deletes ADR describing multi-product constructors.
.gitignore	Removes ignore rule added for confidential testdata directory in #687 stack.
.github/workflows/full_test.yml	Updates actions/checkout version as part of the revert.

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