RhymePad: phonetic rhyme scratchpad for poets & rappers

FastAPI backend with CMU-dict rhyme detection (perfect, internal,
multisyllabic slant, consonance, multi-word phrases), g2p fallback for
unknown words, rhyme/synonym lookup, draggable stanza reordering,
localStorage drafts, and synthesized beats. 19 regression tests drawn
from real verses (Wayne, Em, Kanye).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

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+# RhymePad
+
+A scratchpad for poets & rappers. Write in the pad; rhymes are detected
+phonetically (CMU Pronouncing Dictionary) and color-coded as you type —
+end rhymes, **internal rhymes**, and slant rhymes included. Comes with a
+rhyme/synonym lookup, draggable stanza reordering, and synthesized beats
+with adjustable tempo.
+
+## Run
+
+```console
+$ uv run uvicorn app:app --reload
+```
+
+Then open <http://127.0.0.1:8000>.
+
+## How rhyme detection works
+
+- Every word is mapped to its CMU phonemes (`pronouncing`), with
+  lyric-friendly fallbacks (`runnin'` → `running`, possessives, and a
+  spelling heuristic for made-up words).
+- **Perfect rhymes** share everything from the last stressed vowel on
+  (`tonight` / `light` / `flight` → `AY T`). These are matched anywhere
+  in a line — that's the internal rhyme detection.
+- **Slant rhymes** share just the vowel sounds from the last stressed
+  vowel (`hold` / `coal`). Applied to line endings that didn't find a
+  perfect match.
+- Same color = same sound. Underline = line-ending rhyme (the stanza's
+  a/b/a/b scheme); soft glow only = internal rhyme.
+
+## API
+
+- `POST /api/analyze` `{"text": "..."}` → token spans, rhyme groups,
+  per-stanza schemes
+- `GET /api/lookup?word=light&mode=rhyme|near` → frequency-ranked
+  rhymes / near rhymes, grouped by syllable count
+
+Synonyms come from the free [Datamuse](https://www.datamuse.com/api/)
+API, client-side.