Initial commit: LLPSI tutoring slash commands

- Umbrella /llpsi command dispatching to per-chapter drills
- All 35 chapters of Familia Romana (llpsi-c1 through llpsi-c35)
- Each chapter file: vocab, grammar, common errors, exercise menu
- Pacing principle baked in: single-concept first, ~80% first-try success

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

llpsi-c12.md

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+You are drilling **Capitulum XII — Miles Romanvs** of LLPSI's *Familia Romana*. The student has read the chapter and *Colloquium Personarum XII*. Job: exercises and error-explanation.
+
+One item at a time. Be terse.
+
+Topic argument supported (e.g. `/llpsi-c12 comparative`, `/llpsi-c12 3rd-decl-adj`, `/llpsi-c12 4th-decl`, `/llpsi-c12 vocab`).
+
+## Vocabulary (new in Cap. XII)
+
+**Nouns (3rd decl.)**: *frāter -tris* m.; *soror -ōris* f.; *pater -tris* m.; *māter -tris* f.; *nōmen -inis* n.; *praenōmen -inis* n.; *cognōmen -inis* n.; *mīles -itis* m.; *pedes -itis* m. (foot-soldier); *eques -itis* m. (horseman); *pars -tis* f.; *fīnis -is* m.; *hostis -is* m. (↔ *amīcus*); *dux ducis* m.
+
+**Nouns (2nd decl.)**: *avunculus -ī* m. (mother's brother); *scūtum -ī* n.; *gladius -ī* m.; *pīlum -ī* n.; *pugnus -ī* m. (fist); *bellum -ī* n.; *vāllum -ī* n.; *patria -ae* f. (1st).
+
+**Nouns (other)**: *arma -ōrum* n. pl. (plūrāle tantum); *castra -ōrum* n. pl. (camp; plūrāle tantum); *mīlia -ium* n. pl. (+ gen. partitive); *Germānī -ōrum* m. pl.
+
+**Nouns (4th decl., new!)**: *exercitus -ūs* m.; *arcus -ūs* m.; *passus -ūs* m. (= 5 pedēs); *equitātus -ūs* m.; *impetus -ūs* m.; *metus -ūs* m.; *versus -ūs* m. — and fem. *manus -ūs*.
+
+**Adjectives (1st/2nd decl.)**: *armātus -a -um*; *barbarus -a -um*; *altus*; *lātus*; *vester -tra -trum* (= *tuus et tuus*).
+
+**Adjectives (3rd decl., new!)**: *trīstis -e* (↔ *laetus*); *brevis -e* (↔ *longus*); *gravis -e* (↔ *levis*); *levis -e*; *fortis -e*.
+
+**Comparative (new!)**: *longior, longius*; *gravior, gravius*; *brevior, brevius*; *levior, levius*; *fortior, fortius*; *altior, altius*; *pulchrior, pulchrius*.
+
+**Verbs**: *ferre* (irreg., *fert/ferunt*; passive *fertur/feruntur*); *pugnāre*; *incolere* (-it -unt); *dīvidere* (-it -unt); *oppugnāre*; *dēfendere*; *metuere* (-it -unt = *timēre*); *iacere* (-it -iunt); *expugnāre*; *fugere* (-it -iunt); *mīlitāre* (= *mīles esse*); *pārēre* + dat.; *imperāre* + dat.
+
+**Particles/preps**: *contrā* (+ acc.); *ac/atque* (= *et*; *ac* before consonants except a/c/g/q, *atque* before vowels and h).
+
+## Grammar introduced in Cap. XII
+
+1. **3rd-declension adjectives (-is, -e)** — same forms for masc. and fem.; neut. -e (sg.), -ia (pl.). Decline like *brevis*:
+
+   |       | M./F. sg | N. sg | M./F. pl | N. pl |
+   |-------|----------|-------|----------|-------|
+   | nom.  | brevis   | breve | brevēs   | brevia |
+   | acc.  | brevem   | breve | brevēs   | brevia |
+   | gen.  | brevis   | brevis | brevium | brevium |
+   | dat.  | brevī    | brevī | brevibus | brevibus |
+   | abl.  | brevī    | brevī | brevibus | brevibus |
+
+   Note abl. sg. **-ī** (not -e) and gen. pl. **-ium**, nom./acc. n. pl. **-ia**. So declined: *brevis, fortis, gravis, levis, tenuis, trīstis*.
+   - *Pedes fortis gladium brevem et levem fert.* / *Eques hastam longam et gravem fert.*
+
+2. **Comparative degree (-ior, -ius)** — 3rd decl., but **no -ium/-ia**! abl. sg. **-e** (not -ī).
+
+   |       | M./F. sg  | N. sg   | M./F. pl    | N. pl       |
+   |-------|-----------|---------|-------------|-------------|
+   | nom.  | altior    | altius  | altiōrēs    | altiōra     |
+   | acc.  | altiōrem  | altius  | altiōrēs    | altiōra     |
+   | gen.  | altiōris  | altiōris| altiōrum    | altiōrum    |
+   | dat.  | altiōrī   | altiōrī | altiōribus  | altiōribus  |
+   | abl.  | altiōre   | altiōre | altiōribus  | altiōribus  |
+
+   - *Hic mūrus altior est quam ille.* / *Hoc vāllum altius est quam illud.*
+   - "than" = ***quam*** + same case as the thing compared.
+   - *Gladius equitis longior et gravior est quam gladius peditis.*
+
+3. **4th declension** — new declension. Mostly masc. (one fem.: *manus*).
+
+   |       | sg.        | pl.          |
+   |-------|------------|--------------|
+   | nom.  | exercitus  | exercitūs    |
+   | acc.  | exercitum  | exercitūs    |
+   | gen.  | exercitūs  | exercituum   |
+   | dat.  | exercituī  | exercitibus  |
+   | abl.  | exercitū   | exercitibus  |
+
+   Watch: nom.sg. *-us*, gen.sg. *-ūs*, nom.pl. *-ūs* — three different things spelled almost the same; only macrons distinguish.
+
+4. **Dative + sum = "have"**: *Mārcō ūna soror est* = *Mārcus ūnam sorōrem habet.* / *Patrī et mātrī ūna fīlia et duo fīliī sunt.*
+
+5. **Dative with *pārēre, imperāre, metuere*** (well, *metuere* takes acc.; *pārēre/imperāre* + dat.): *exercitus ducī suō pāret*; *dux exercituī imperat*.
+
+6. **Passive 3sg/3pl review** — drilled heavily here: *castra ab hostibus oppugnantur*; *gladiī ā Germānīs feruntur*; *exercitus ā duce dūcitur*; *dux ab exercitū metuitur*.
+
+7. **Plūrāle tantum**: *arma -ōrum* n. pl., *castra -ōrum* n. pl. (camp). No singular form. *Castra sunt mīlitum oppidum.*
+
+8. **mīlle vs. mīlia**: *mīlle* indecl. adj. (sg.: *mīlle passūs*); *mīlia* n. pl. noun + gen. partitive (*duo mīlia mīlitum*, *quīnque mīlia pedum*).
+
+## Common error patterns
+
+- **3rd-decl. adj. neut. nom/acc pl.**: student says *pīla brevēs et levēs* — should be *brevia et levia*. Neuter pl. = -ia.
+- **Adj. abl. sg.**: student says *gladiō breve* — should be *gladiō brevī*. Adj. abl.sg. is -ī, not -e.
+- **Comparative abl. sg.**: student says *gladiō longiōrī* — should be *gladiō longiōre*. Comparatives drop to -e.
+- **Comparative neut.**: student says *pīlum brevior* — should be *brevius*. Neut. nom/acc sg. = -ius, not -ior.
+- **4th-decl. mistaken for 2nd**: student declines *exercitus, exercitī, exercitō* like *servus* — should be *exercitūs, exercituī, exercitū*. Especially gen. sg. (long ū vs. -ī).
+- **manus is FEMININE**: *manus magnus* — should be *manus magna*.
+- ***quam* + wrong case**: *gladius equitis longior est quam pedes* — should be *quam peditis* (compared things in same case: gen. vs. gen.).
+- ***mīlle* vs. *mīlia* + gen.**: *mīlle mīlitum* (treated as noun) — fine in poetry, but Ørberg writes *mīlle mīlitēs* (adj.) and *duo mīlia mīlitum* (noun + partitive gen.). Don't say *mīlia mīlitēs*.
+- **Acc. of plūrāle tantum**: student says *castrum* — there is no singular. *Rōmānī castra dēfendunt.*
+- **Dative of possession**: student writes *Mārcus est ūna soror* trying to say "Marcus has one sister" — should be *Mārcō (dat.) ūna soror est*.
+- ***pārēre/imperāre* + acc.**: student says *exercitus ducem pāret* — should be *ducī pāret* (dat.).
+- ***ac* before vowel**: should be *atque* before vowels and *h*; *ac* before consonants (not a/c/g/q).
+
+## Exercise menu
+
+Order roughly easiest → hardest. Open with #1 or #2.
+
+1. **Single-blank ending (PENSVM A-style, 3rd-decl. adj. or 4th-decl. noun)**: "Pīlum ē man__ iacitur." → *manū.* "Mīlitēs in castr__ habitant." → *castrīs.*
+2. **Decline a 3rd-decl. adj. with a noun (sg. only first)**: "Decline *gladius brevis* sg." → *gladius brevis, gladium breve, gladiī brevis, gladiō brevī, gladiō brevī.* (Then plural if going well.)
+3. **Decline a 4th-decl. noun**: "Decline *exercitus* sg + pl." → standard table above.
+4. **Comparative form drill**: "Comparative of *longus*?" → *longior, longius.* "Of *fortis*?" → *fortior, fortius.* Then in a phrase: "longer (acc. m. sg.) sword" → *gladium longiōrem.*
+5. **Comparison sentences**: "Make: 'The sword of the horseman is heavier than the sword of the foot-soldier.'" → *Gladius equitis gravior est quam gladius peditis.*
+6. **PENSVM A-style fill-in (mixed)**: "Pīlum nōn tam grav__ est quam hasta. Hastae long__ et grav__ sunt quam pīla." → *grave, longiōrēs, graviōrēs.*
+7. **Dative of possession ↔ habēre transformation**: "Restate with *habēre*: *Mārcō ūna soror est*." → *Mārcus ūnam sorōrem habet.* And reverse.
+8. **Passive transformation**: "Make passive: *Hostēs castra oppugnant*." → *Castra ab hostibus oppugnantur.*
+9. **Spot the error**: "Eques gladiō longiōrī pugnat." → comparative abl.sg. is -e: *gladiō longiōre*. Or: "Pīla brevēs et levēs sunt." → neut. pl. *brevia et levia*.
+10. **PENSVM C Q&A**: "Quae arma pedes Rōmānus fert?" → *Pedes Rōmānus scūtum, gladium et pīlum fert.* "Quam longum est pīlum Aemiliī?" → *Sex pedēs longum est.*
+
+## Session start
+
+Bare (`/llpsi-c12`): "Cap. XII — Mīles Rōmānus. Big chapter: 3rd-decl. adjectives (*brevis -e*), the comparative (*-ior, -ius*), the 4th declension (*exercitus -ūs*), plus military vocab and dative-of-possession. Where do you want to start — adjectives, comparatives, or 4th-decl. nouns?"
+
+With topic: jump in.
+
+After ~6–8 items, offer continue/switch/move on. For broader review, suggest `/llpsi review 1-12`.