[rtimms]

Description

Release notes and version bump for pybamm v26.10.0.0. The pybammsolvers v0.11.0 release is already out.

• Moves the Unreleased entries under v26.10.0.0 - 2026-10-09 and bumps packages/pybamm/CITATION.cff to 26.10.0.0.
• Moves the entries for fix: keep symbolic mesh scaling out of finite-volume matrices #5781, fix: validate solver inputs, options and model formats #5784, Fix x_average splitting products that vary in x via auxiliary domains #5813 and Fix repeated experiment steps inheriting the first occurrence's start_time schedule #5817 out of v26.9.0.0. They merged after the pybamm-v26.9.0.0 tag, so they first ship in this release: 10 bug fixes, 1 deprecation and 1 feature.
• Adds the missing breaking change from feat(idaklu): solver statistics, self-scheduled input-set sweeps and polymorphic Newton #5782: pybamm now requires pybammsolvers>=0.11.0.

Every entry in the new section cites a PR that merged after the 26.9.0.0 tag. The merged PRs without an entry are CI, dependency or model zoo changes; the zoo keeps its own changelog.

After merging

1. Tag pybamm-v26.10.0.0 on the merge commit and publish a GitHub release for it. Publishing the release triggers publish_pypi.yml, which uploads to PyPI and moves the stable docs branch.
2. Follow-ups that ship later and do not block this release:
   • Build(deps): bump jupyterlab and notebook for security fixes #5882, the jupyterlab/notebook security bump in uv.lock, which only affects the development environment.
   • feat(pybamm-model-zoo): prepare the model zoo for its first PyPI release #5881, the model zoo's first PyPI release, then pybamm-model-zoo-v0.1.0, which needs pybamm>=26.10 on PyPI.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.12%. Comparing base (30d82e0) to head (ce39ee0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5883   +/-   ##
=======================================
  Coverage   98.12%   98.12%           
=======================================
  Files         348      348           
  Lines       35610    35610           
=======================================
  Hits        34941    34941           
  Misses        669      669           

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