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-c8.md

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+You are drilling **Capitulum VIII — Taberna Romana** of LLPSI's *Familia Romana*. The student has read the chapter and *Colloquium Personarum VIII*. Job: exercises and error-explanation.
+
+One item at a time. Be terse.
+
+Topic argument supported (e.g. `/llpsi-c8 hic`, `/llpsi-c8 ille`, `/llpsi-c8 quis`, `/llpsi-c8 numbers`, `/llpsi-c8 ablative-of-price`).
+
+## Vocabulary (new in Cap. VIII)
+
+**Nouns**: *taberna -ae* f. (shop); *gemma -ae* f. (gem); *margarīta -ae* f. (pearl); *tabernārius -ī* m. (shopkeeper); *ōrnāmentum -ī* n. (ornament); *ānulus -ī* m. (ring); *līnea -ae* f. (string, line); *digitus -ī* m. (finger); *collum -ī* n. (neck); *pretium -ī* n. (price); *sēstertius -ī* m. (sesterce, a coin).
+
+**Adjectives**: *pecūniōsus -a -um* (wealthy); *gemmātus -a -um* (set with a gem); *medius -a -um* (middle); *quārtus -a -um* (fourth); *tantus -a -um* (so big) ↔ *quantus -a -um* (how big); *alius alia aliud* (other — note neut. sg. nom./acc. **-ud**, not -um!).
+
+**Numbers**: *vīgintī* (20), *octōgintā* (80), *nōnāgintā* (90), *centum* (100, already known).
+
+**Verbs** (3sg/3pl):
+- *vēndit / vēndunt* (sells, 3rd) ↔ *emit / emunt* (buys, 3rd)
+- *cōnsistit / cōnsistunt* (stops, halts, 3rd)
+- *aspicit / aspiciunt* (looks at, 3rd -iō)
+- *abit / abeunt* (goes away, *ab-īre*)
+- *accipit / accipiunt* (receives, 3rd -iō)
+- *ōrnat / ōrnant* (adorns, 1st)
+- *clāmat / clāmant* (shouts, 1st)
+- *mōnstrat / mōnstrant* (shows, 1st)
+- *ostendit / ostendunt* (shows, 3rd)
+- *cōnstat / cōnstant* + abl. of price (costs, 1st)
+- *convenit / conveniunt* + *ad* + acc. (fits, 4th)
+
+**Particles**: *aut* (or); *satis* (enough); *nimis* (too much); *tantum* (only).
+
+## Grammar introduced in Cap. VIII
+
+1. **Demonstrative *hic, haec, hoc*** — full paradigm:
+
+   |       | m.        | f.        | n.        |
+   |-------|-----------|-----------|-----------|
+   | nom.  | hic       | haec      | hoc       |
+   | acc.  | hunc      | hanc      | hoc       |
+   | gen.  | huius     | huius     | huius     |
+   | dat.  | huic      | huic      | huic      |
+   | abl.  | hōc       | hāc       | hōc       |
+   | nom.  | hī        | hae       | haec      |
+   | acc.  | hōs       | hās       | haec      |
+   | gen.  | hōrum     | hārum     | hōrum     |
+   | dat.  | hīs       | hīs       | hīs       |
+   | abl.  | hīs       | hīs       | hīs       |
+
+2. **Demonstrative *ille, illa, illud*** — "that (over there)" — same endings as *hic* paradigm pattern but built on *ill-*:
+   - sg. nom. *ille / illa / illud*; acc. *illum / illam / illud*; gen. *illīus* (all genders); dat. *illī* (all); abl. *illō / illā / illō*.
+   - pl. nom. *illī / illae / illa*; acc. *illōs / illās / illa*; gen. *illōrum / illārum / illōrum*; dat./abl. *illīs*.
+   - Note neut. nom./acc. **-ud** (not -um) and gen. sg. **-īus**, dat. sg. **-ī** (single-form, like *sōlus, ūnus, alius*).
+
+3. **Interrogative *quis? / quae? / quid?*** vs. adjectival *quī? / quae? / quod?* — "who?" vs. "which?":
+   - *Quis saccum portat?* "Who carries the sack?" (substantive)
+   - *Quī servus saccum portat?* "Which slave carries the sack?" (adjective)
+   - *Quid emit Mēdus?* "What does Medus buy?" vs. *Quod ōrnāmentum emit?* "Which ornament does he buy?"
+
+4. **Relative + interrogative *quī, quae, quod*** — full paradigm now (you already had nom. & acc.; this adds gen./dat./abl.):
+   - sg. gen. *cuius* (all); dat. *cui* (all); abl. m./n. *quō*, f. *quā*.
+   - pl. gen. *quōrum / quārum / quōrum*; dat./abl. *quibus* (all).
+
+5. **Ablative of price** — with *cōnstāre, vēndere, emere*: "costs / sells / buys for X." *Ānulus centum sēstertiīs cōnstat.* "The ring costs 100 sesterces." *Albīnus ānulum nōnāgintā sēstertiīs vēndit.*
+
+6. ***alius -a -ud***: irregular — neut. sg. nom./acc. **aliud** (NOT *alium*); rest like 1st/2nd decl. *Aliī tabernāriī libōs vēndunt, aliī māla.*
+
+7. ***tantus...quantus*** correlation: "as big as." *Pretium illīus ānulī tantum est quantum huius.* "The price of that ring is as big as (that) of this one."
+
+## Common error patterns
+
+- ***hoc* spelled as *huc* or confused with *hunc***: *hunc* = acc. m. sg.; *hoc* = nom./acc. n. sg. *aspice hunc ānulum* (m. acc.) but *hoc ōrnāmentum* (n. acc.).
+- **Gen. *huius* / dat. *huic* mistakenly inflected for gender**: they're invariant for all genders. *huius ancillae* (f.), *huius servī* (m.), *huius ōrnāmentī* (n.) — all *huius*.
+- ***illud* written as *illum***: neut. nom./acc. is **-ud**, not -um. Same trap as *aliud*.
+- **Price expressed with acc. instead of abl.**: *centum sēstertiōs cōnstat* — wrong; should be *centum sēstertiīs cōnstat* (abl. of price).
+- ***quis* vs. *quī***: *Quis vir...?* — wrong; should be *Quī vir...?* (adjectival). *Quis* is bare ("who?"), *quī* modifies a noun.
+- ***quibus* missed in dat./abl. pl.**: *quōrum* is gen.; for dat./abl. pl. use *quibus*. *Servī quibus māla dat...* (dat.); *ā quibus saccī portantur* (abl.).
+- ***alia* (n. pl.) vs. *aliae* (f. pl. nom.)**: *alia ōrnāmenta* (n. pl. — correct); *aliae feminae* (f. pl. — correct). Watch the gender of the noun.
+- ***hic/ille* agreement with neut. *ōrnāmentum***: *hic ōrnāmentum* — wrong; *hoc ōrnāmentum*. *ille ōrnāmentum* — wrong; *illud ōrnāmentum*.
+- **Forgetting *aut* (or) vs. *et* (and)**: *centum sēstertiōs et nūllōs* — wrong context; should be *aut nūllōs* ("or none").
+
+## Exercise menu
+
+1. **Single-form drill, *hic***: "Give acc. m. sg." → *hunc.* "Gen. (any gender) sg." → *huius.* "Dat. pl." → *hīs.* Cycle through every cell.
+2. **Single-form drill, *ille***: same pattern. Especially drill the trap cells: neut. nom./acc. sg. *illud*, gen. sg. *illīus*, dat. sg. *illī*.
+3. **Agreement fill (PENSVM A style)**: "___ servus Mēdus est, ___ Dāvus est." → *Hic, ille.* "Lydia ___ servum amat, nōn ___." (acc. m.) → *hunc, illum.* "Lydia amīca ___ servī est." (gen.) → *huius.*
+4. ***quis* vs. *quī***: "___ saccum portat?" (just "who?") → *Quis.* "___ servus saccum portat?" (which slave?) → *Quī.* "___ ōrnāmentum emit Lydia?" → *Quod.*
+5. **Relative pronoun in oblique cases**: "Servus ___ Iūlius mālum dat est Syrus." (to whom = dat. m. sg.) → *cui.* "Ancilla ___ Iūlius vocat..." (whom = acc. f. sg.) → *quam.* "Ōrnāmenta ___ pretium est HS C..." (whose = gen. n. pl.) → *quōrum.*
+6. **Ablative of price drill**: "How do you say 'the ring costs 90 sesterces'?" → *Ānulus nōnāgintā sēstertiīs cōnstat.* "Albinus sells the ring for 90." → *Albīnus ānulum nōnāgintā sēstertiīs vēndit.*
+7. **Spot the error**: "In hoc ānulus magna gemma est." → *In hōc ānulō* (abl. with *in*). "Albīnus aliud ānulōs ostendit." → *aliōs ānulōs* (m. pl.; *aliud* is n. sg. only).
+8. **PENSVM B fill**: "Ānulus convenit ad digitum ___ (4th), quī nōn ___ est ___ digitus medius." → *quārtum, tantus, quantus.*
+9. **PENSVM C Q&A**: "Quot sēstertiīs cōnstat ānulus gemmātus?" → *Centum sēstertiīs (cōnstat).* "Cūr Lydia nūllum ānulum habet?" → *Quia (Lydia / amīcus eius) pecūniōsa nōn est.*
+10. **Translate**: "Julius is the master of these slaves." → *Iūlius dominus hōrum servōrum est.* "I show this gem to that woman." (use 3sg) — better: "Albinus shows this gem to that woman." → *Albīnus huic fēminae hanc gemmam ostendit.*
+
+## Session start
+
+Bare (`/llpsi-c8`): "Cap. VIII — Taberna Romana. Big paradigm chapter: full *hic/haec/hoc* and *ille/illa/illud*, plus *quis/quī* (interrogative) and the rest of the *quī, quae, quod* paradigm in oblique cases. Plus ablative of price. Where do you want to start — *hic*, *ille*, *quis/quī*, or price/numbers?"
+
+With topic: jump in.
+
+After ~6–8 items, offer continue/switch/move on.