`pyssg.contrib`

Community-contributed plugins.

These live apart from the built-in plugins in :mod:pyssg.plugins: they follow the same Plugin protocol and the same purity rules, and may use third-party libraries (they are peripheral adapters, never imported by pyssg.core), but they are maintained by the community rather than the core.

Conventions for a contrib plugin (one module pyssg/contrib/<name>.py):

expose a factory function <name>() returning the plugin instance, exactly like the built-ins, so a config can from pyssg.contrib.<name> import <name>;
declare name and cache_version attributes and implement apply;
be pure: derive output only from declared inputs -- no clock, randomness or global mutable state -- so two builds stay byte-identical and incremental rebuilds equal full rebuilds;
ship a unit test and pass mypy --strict + ruff.

Unlike the built-ins, contrib plugins are intentionally not re-exported from this package; import them explicitly by module so each contribution stays opt-in and independent.