Add Modern Standard Arabic — the first templatic engine (Verified)

[v4nn4]

The headline of the Arabic-family goal, and ablaut's first root-and-pattern engine.

Approach

Arabic is cited by the unvoweled consonantal skeleton (كتب), which doesn't fix the vocalisation, so the paradigm can't be voweled from the lemma alone. The engine resolves each lemma to four fully-voweled principal parts (perfect/imperfect × active/passive 3sg-masc, mined into data/ara/parts.tsv) and derives the whole paradigm by regular person/number/gender/mood/voice affixation + weak-root morphophonemics — hollow, defective, doubled, assimilated, hamzated, generalised across the derived forms II–X. A small mined-override layer (data/ara/overrides.tsv, 1,112 cells) patches the irregular residue (doubly-weak, hamza-hollow).

Verification

Two independent oracles — kaikki.org (Wiktextract) ∩ UniMorph — normalised to a shared canonical feature vocabulary. The otiose-alif spelling of the -ū plural was the main systematic split; normalising it lifted agreement to ~94%, a ~48,300-cell gold across 640 lemmas.

Golden gate: forms 48288/48288 (100.00%), lemma coverage 640/640 (100.00%).
Split: 97.7% rule-derived, 2.3% overridden.

Registration

Lang::Ara, from_code ar/ara/arabic, Conjugation::Ara + build dispatch, a 9-group serde Table (perfect/imperfect/subjunctive/jussive/imperative × active+passive), reverse index, PyO3 + wasm bindings, Cargo includes, correctness.py, and the CI two-oracle gate. All green: 330 lib tests, clippy -D warnings, fmt --check, --features python and --features wasm.

Notes

• The unvoweled lemma is inherently ambiguous for homographs (كتب resolves to the dataset's Form-II kattaba, not Form-I kataba); the engine faithfully reproduces whichever reading the oracles carry.
• Participles and the verbal noun are nominal and out of the verb paradigm.
• Web wiring (RTL, tense-group tiles) is a separate follow-up.

First of the Semitic set; Egyptian Arabic (data already banked), Hebrew, Amharic, Syriac, Maltese follow.

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