docs: add parquet stale-artifact guard workflow

docs: align release and branch-refresh workflow with current pipeline

tools: standardize UD version flag on --ud-ver

tools: make version selection flag-driven and optional-env

tools: harden path handling and align docs/options

tools: unify wrappers and optimize fetch/metadata scripts

Unify release-handle mapping and harden tools pipeline

Switch UD fetch pipeline to CLARIN snapshots

Disentangle tools/README.md and ADDING_NEW_UD_VERSION.md

Update documentation for renamed scripts

Revert README.md to 541812f0 and update with tools/ content

Complete v2.0 upgrade: 100% verbatim reconstruction validated

Fix double commit and avoid `git push -f`

Update doc info for new version

Add info for new version

Initial commit