Carry Doxygen @param[out] through the catalog as shape.outParams

[estebanzimanyi]

Extract the OUT direction of each parameter from the MEOS C Doxygen @param[out] tag and expose it as shape.outParams — the sibling of shape.nullable. This is the single, explicit source-of-truth for which arguments a function writes to, so every binding can fold an out-param (allocate the buffer, pass it, read the value back) from one catalog signal instead of a per-binding guess: JMEOS's hardcoded result/size_out parameter-name whitelist, or a type/position heuristic that misfires on in-place mutators (meos_array_destroy, skiplist_free, *_compute_bbox).

The Doxygen tags are manually maintained, so the flag is emitted only when the tag agrees with the C signature — the parameter must be a non-const pointer. A tag on a by-value parameter (@param[out] count int), on a const pointer, or whose name is absent from the signature (the header declares size while the .c doc says size_out) is a documentation discrepancy: it is dropped and reported, never trusted. That cross-check is what keeps a stray annotation from corrupting a binding signature.

On the current sources this validates 438 out-params into shape.outParams and reports 40 discrepancies for cleanup at the MEOS source.

parser/outparam.py mirrors parser/nullable.py; run.py runs the pass right after merge_nullable and prints the count + the discrepancy list. The field is additive — no existing consumer changes.