Phase 31: Literate notebook examples gallery

[gparadis]

Goal:
Substantially enhance the examples seed from Phase 30 with actual known-valid Jupyter .ipynb notebook files and matching Sphinx gallery documentation.

The examples follow a literate-programming style: headings and subheadings, explanatory markdown before code, code cells, expected outputs, and enough context that a motivated graduate student can open the notebook and understand what is happening without reverse-engineering package internals.

Release target: modelwright==0.1.0a6

Branch: feature/p31-literate-notebook-examples

Status: complete

Child tasks:

• P31.1 Define literate notebook example contract. Child issue: P31.1 Define literate notebook example contract #187.
• P31.2 Add synthetic .ipynb notebook example. Child issue: P31.2 Add synthetic ipynb notebook example #185.
• P31.3 Add 2020 FABLE .ipynb notebook example. Child issue: P31.3 Add 2020 FABLE ipynb notebook example #186.
• P31.4 Integrate notebooks into the Sphinx Examples Gallery. Child issue: P31.4 Integrate notebooks into examples gallery docs #184.
• P31.5 Validate notebook examples and docs. Child issue: P31.5 Validate notebook examples and docs #188.
• P31.6 Publish modelwright==0.1.0a6. Child issue: P31.6 Publish modelwright 0.1.0a6 #189.

Final evidence:

• Added examples/notebooks/synthetic-notebook-interface.ipynb.
• Added examples/notebooks/fable-2020-notebook-interface.ipynb.
• Sphinx Examples Gallery links to downloadable notebooks.
• Default tests validate notebook JSON, Python kernel metadata, literate structure, stored outputs, synthetic execution, and static FABLE validation-boundary output.
• PR Add literate notebook examples gallery #190 merged to main at 3699baa.
• Annotated tag v0.1.0a6 was pushed.
• Release workflow run 27978838686 completed successfully and published to PyPI.
• GitHub prerelease modelwright 0.1.0a6 was created.
• Clean ignored PyPI install verified modelwright[notebook]==0.1.0a6, import version, notebook helper import, old-import absence, and CLI help.
• Live GitHub Pages docs verified the Examples Gallery, both notebook example pages, both deployed notebook downloads, and 0.1.0a6 release-deployment content.
• Closeout commit 12c86ad records the release result in ROADMAP.md and CHANGE_LOG.md.

Acceptance boundary:

• May claim tracked, known-valid literate notebook examples for synthetic and generated 2020 FABLE notebook/DataFrame workflows.
• May claim Sphinx Examples Gallery pages that link to actual .ipynb notebooks.
• Must not claim a full spreadsheet UI, automatic workbook semantic recovery, stable public API compatibility, or Excel-backed recalculation equivalence.

[gparadis]

Phase 31 is complete in modelwright 0.1.0a6. PR #190 merged, tag v0.1.0a6 published to PyPI, GitHub prerelease and deployed docs/notebook downloads are verified, and closeout is recorded in 12c86ad.