Add 13 new grammar notes with 1010 exercises from video extraction

Scraped a 4h Spanish fundamentals YouTube video (transcript + OCR on
14810 frames), extracted structured content across 52 chapters, and
generated fill-in-the-blank quizzes for every grammar topic.

- 13 new GrammarNote entries (articles, possessives, demonstratives,
  greetings, poder, al/del, prepositional pronouns, irregular yo,
  stem-changing, stressed possessives, present/future perfect, present
  indicative conjugation)
- 1010 generated exercises across all 36 grammar notes (new + existing)
- Fix tense guide parser to handle unnumbered *Usages* blocks
- Rewrite 6 broken tense guide bodies (imperative, subj pluperfect,
  subj future) with numbered usage format
- Bump courseDataVersion 5→6 with TenseGuide refresh on upgrade
- Add docs/spanish-fundamentals/ with raw transcripts, polished notes,
  structured JSON, and exercise data

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/spanish-fundamentals/notes/38-past-participles-as-adjectives.md

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+# 38. Past Participles As Adjectives
+
+> Source: [A Complete Guide To Every Fundamental In Spanish (The Conclusion)](https://youtube.com/watch?v=YHDZSHCt1DE&t=10646s)
+
+Past participles in Spanish (`hablado`, `comido`, `vivido`) can act as adjectives describing the condition of a noun. As adjectives, they agree in gender and number with the noun and are typically paired with `estar`.
+
+## Key Rules
+- **Regular -ar** → drop `-ar`, add `-ado`: `hablar → hablado`.
+- **Regular -er/-ir** → drop ending, add `-ido`: `comer → comido`, `vivir → vivido`.
+- **-er/-ir with two vowels** require an accent on the `í`: `caer → caído`, `creer → creído`, `leer → leído`, `oír → oído`, `reír → reído`, `sonreír → sonreído`, `traer → traído`.
+- **Common irregulars**: `abierto, dicho, descrito, descubierto, escrito, hecho, muerto, puesto, resuelto, roto, visto, vuelto, cubierto`.
+- **As adjective**: must agree in gender/number — `cerrada, cerrados, cerradas`. Place after the noun: `la puerta cerrada`.
+- **With estar**: describes a current state — `La puerta está cerrada` (it's closed right now).
+- **Position**: as a regular adjective it follows the noun (`el libro abierto`).
+
+## Conjugation / Pattern Tables
+
+### Irregular past participles
+| Infinitive | Participle | Meaning |
+|---|---|---|
+| abrir | abierto | opened |
+| decir | dicho | said/told |
+| describir | descrito | described |
+| descubrir | descubierto | discovered |
+| escribir | escrito | written |
+| hacer | hecho | done/made |
+| morir | muerto | dead |
+| poner | puesto | put |
+| resolver | resuelto | resolved |
+| romper | roto | broken |
+| ver | visto | seen |
+| volver | vuelto | returned |
+| cubrir | cubierto | covered |
+
+## Examples
+| Spanish | English |
+|---|---|
+| Yo cerré la puerta. | I closed the door. |
+| La puerta está cerrada. | The door is closed. |
+| La puerta cerrada. | The closed door. |
+| El libro está abierto. | The book is open. |
+| El libro abierto. | The open book. |
+| Los textos están escritos. | The texts are written. |
+| Los textos escritos. | The written texts. |
+| La cama está hecha. | The bed is made. |
+| El problema está resuelto. | The problem is resolved. |
+| Mis respuestas están completas. | My answers are completed. |
+| El día está muerto. | The day is dead. |
+| El Día de los Muertos. | The Day of the Dead. |
+
+## Notes & Gotchas
+- Distinguish *I finished* (preterite: `Yo terminé`) from *I am finished* (state: `Yo estoy terminado/a`).
+- Compound verb past participles do NOT agree in gender/number with `haber` — only when used as adjectives.
+- Always pair condition descriptions with `estar`, not `ser` (state vs. essence).