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Fix merge: restore files from main and remove old festschrift duplicates - Restore docs/ files to match main (remove old layout files, restore fst-variants.json) - Remove old CI files (.github/workflows/docsygen.yml, .taskcluster.yml) - Remove duplicate src/ files that were moved to src/fst/ in main - Remove 21 old gramcheck yaml test files replaced by new naming scheme in main - Restore tools/grammarcheckers/Working_Files/ from main - Keep festschrift-specific files: * devtools/testdata/oldstuff/ (intentionally moved during merge) * tools/spellcheckers/editdist.festschrift.regex (festschrift research)