Support exclude-newer policies - #905
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Description
Implements the conda-libmamba-solver side of conda/conda#15761 by consuming conda's resolved
ExcludeNewerPolicy.The solver declares support for global, channel, and package policies. A global-only policy uses libmambapy 2.9.0 or newer's native
exclude_newer_timestampdatabase setting. Older supported libmambapy versions and scoped policies use the Python repodata filter.The native path skips serialized
.solvcaches because libmamba does not apply the cutoff when loading them. It also preserves installed records. Sharded repodata is filtered in Python soindexed_timestampkeeps precedence over the build timestamp.This requires conda 26.9.0 or newer. The runtime libmambapy dependency remains
>=2.0.0,!=2.6.2, with native filtering enabled automatically for libmambapy 2.9.0 or newer. Development and CI require libmambapy 2.9.0 or newer so the native constructor path is covered.CI is temporarily pinned to
jezdez/conda@a5094a3ae2df8d21843d40780278fc2f9eff3e27until conda/conda#15761 lands.Part of conda/conda#15759.
Checklist - did you ...
newsdirectory (using the template) for the next release's release notes?Add / update outdated documentation?