refactor(dots-tts): extract TTS stack to tts-stack repo; pointer stub + move voices out

TTS development moves to a dedicated repo (~/development/tts-stack) so a separate
agent can own tuning/dev. Mirrors the chatterbox-fast extraction:

- stacks/dots-tts/ reduced to a pointer README (code/Dockerfile/compose/tests/env
  now canonical in tts-stack).
- voices/ canonical corpus moved out to tts-stack/voices/. Blast-radius checked:
  no eshpfi playbook/script reads the corpus (other voices/ refs are unrelated
  host paths under /worktank/...).
- persistent-memory updated: TTS dev extracted + stood down; reverses the earlier
  "corpus home = eshpfi voices/" call.

The ~15 experimental TTS compose wrappers stay here as reference (catalogued in
tts-stack/KNOWLEDGE.md). Live service on irv-ml1:8198 is unaffected (runs from a
copy on the host).

persistent-memory.md

@@ -111,7 +111,7 @@ no longer deployed sidecars here. See Recent decisions.)
 
 _As of 2026-08-10 — long session; the dots.tts TTS-engine + LFM2.5 arcs LANDED (full detail per arc in Recent decisions). Genuinely in-flight is thin:_
 
-- **dots.tts is the new fleet RP-TTS engine — LIVE + consumer-confirmed.** v3 on irv-ml1:8198 (curly-sanitize + sentence-chunking + clause-break→period pause mapping), ratatoskr migrated + verified clean end-to-end; chatterbox-fast RECLAIMED (:8197 stopped, revive `docker start chatterbox-fast`). Canonical voice corpus in `voices/`. ⚠ WATCH: deployed container GPU creeps ~6→14GB/8h (cache accumulation; a redeploy resets it); the **pinned Dockerfile is the only rebuild path** until upstream fixes the phantom `gradio==6.17.0` constraint. Full arc → Recent decisions.
+- **dots.tts is the new fleet RP-TTS engine — LIVE + consumer-confirmed.** v3 on irv-ml1:8198 (curly-sanitize + sentence-chunking + clause-break→period pause mapping), ratatoskr migrated + verified clean end-to-end; chatterbox-fast RECLAIMED (:8197 stopped, revive `docker start chatterbox-fast`). ⚠ WATCH: deployed container GPU creeps ~6→14GB/8h (cache accumulation; a redeploy resets it); the **pinned Dockerfile is the only rebuild path** until upstream fixes the phantom `gradio==6.17.0` constraint. Full arc → Recent decisions. **⤳ TTS DEV EXTRACTED to the dedicated `tts-stack` repo (`~/development/tts-stack`, 2026-08-11) — eshpfi `stacks/dots-tts/` is now a POINTER stub, `voices/` MOVED out. Do all TTS work in tts-stack; this session STOOD DOWN TTS dev.**
 
 - **LFM2.5-2.6b bake-off alias for brokkr — DELIVERED, awaiting his bench.** `vllm-lfm25` ana-ml2:8021 + LiteLLM `lfm2.5-2.6b` (deepseek_r1 reasoning-parser, vendor sampling); PRODUCTION-CLEARED (operator <USD 10M ruling) but kept OUT of default/fallback routing per brokkr's measurement gate. Peer-side now.
 
@@ -132,6 +132,8 @@ _As of 2026-08-10 — long session; the dots.tts TTS-engine + LFM2.5 arcs LANDED
 
 ## Recent decisions
 
+- `[2026-08-11]` **TTS stack extracted to its own repo (`tts-stack`) + eshpfi stood down on TTS dev.** Operator: hand all TTS tuning/dev to a separate agent with a self-contained repo (knowledge + infra access + a live knowledge list), and move the voice corpus in. New repo `~/development/tts-stack` (commit `9ee3288`) carries: dots-tts stack (canonical intent), `voices/` corpus (MOVED out of eshpfi), `KNOWLEDGE.md` (engine landscape + prosody findings + foot-guns), `docs/infrastructure.md` (irv-ml1 access + gated deploy runbook + rollback), CLAUDE/persistent-memory/ROADMAP, `tools/` (pause-probe + Booth render). Followed the **chatterbox-fast precedent**: eshpfi `stacks/dots-tts/` reduced to a POINTER README; the ~15 experimental TTS compose wrappers stay here as reference (catalogued in tts-stack KNOWLEDGE). Blast-radius check: no eshpfi playbook/script reads the canonical corpus (other `voices/` refs = unrelated host paths). **Reverses** the earlier "Corpus home = eshpfi `voices/` (keep-here)" call. ⚠ tts-stack is LOCAL-ONLY until pushed — needs a gitea remote (`vh/tts-stack`) + push before the separate agent can clone (operator's call — outward-facing + repo-create creds).
+
 - `[2026-08-10]` **dots-tts v3 — clause-break → period pause mapping.** Operator: v2 "sounds good" but donut won't pause at semicolons/dashes. ROOT CAUSE (measured via a pause-probe A/B — synth duration over N runs, non-determinism averaged out): dots' prosody honors a real pause **only for ellipsis (~+0.43s) and period (~+0.3s, capitalization-independent)**; comma/semicolon/colon/dash all run **flat (~+0.03s vs no-punct)**. Two distinct sub-causes: **dashes regressed in v2** (the `—`→`-` fold made em-dashes read as word-joiners), while **semicolons were NEVER a v2 change** — dots ignores them natively, only newly noticeable because v2 made everything else clean. Operator call: ellipsis "too much" → **map `;`, clause `:`, and em-dash `—` → period** in `_sanitize` (believable ~0.3s clause break). GUARDS (pinned by 11 unit tests, `stacks/dots-tts/test_sanitize.py`): digit-guarded colon `(?<!\d)\s*:\s*(?!\d)` so times `3:45` / ratios `2:1` survive; en-dash `–`→hyphen KEPT (numeric-range `10–20` safety — em-dash breaks, en-dash ranges, different jobs); genuine ellipsis left at full strength (author meant a long pause). Gated deploy (redeploy2 pattern → v3): build → throwaway :8199 test container + **pause-gate** (semicolon sentence must run ≥0.12s longer than baseline; measured **+0.427s**) → only then cut live over. LIVE + healthy `local/dots-tts:v3` on :8198. **rollback = `sed -i 's/^DOTS_TAG=.*/DOTS_TAG=v2/' .env + docker compose up -d dots-tts`** (v2 image retained). Booth `dots-pauses` (A=old-flat / C=ellipsis-too-much / D=live-v3). [[reference_chatterbox_fast_repo]]
 
 - `[2026-08-10]` **dots-tts v2 — contraction fix (curly-sanitize) + sentence-chunking + dependency-pin recovery.** Operator: donut read contractions wrong ("you're"→"you ree", "donut's"→"donut ess"). ROOT CAUSE (isolated via A/B booth): **curly/typographic apostrophes** (`’` U+2019 from ratatoskr's LLM) — dots' tokenizer mispronounces them; STRAIGHT apostrophes read clean under `normalize_text=True`. FIX (`app.py`): fold curly→ASCII (`str.maketrans`) before synth, **KEEP `normalize_text=True`** (operator call — retains number/date expansion). Also added **server-side sentence-chunking** (pack ≤280 chars): dots caps one `generate()` at ~500 patches/~40s, so long RP turns (the Zev monologue = 160s audio) truncated; chunking stitches them (verified full 160.3s, not 40s-cut). **⚠ BUILD FOOT-GUNS (both bit this redeploy):** (1) upstream dots.tts `constraints/recommended.txt` now pins **`gradio==6.17.0` — phantom, not on PyPI** → fresh `pip install dots.tts` unsatisfiable; FIX = pin `dots.tts==0.2.1` + **DROP** the `-c recommended.txt` constraints (0.2.1 pulls working gradio 6.17.3). (2) pinning only `torch==2.8.0` let **torchaudio float to 2.11.0 → dots.tts refuses to load** (minor-version match check); FIX = pin `torchaudio==2.8.0`. **⚠ DEPLOY LESSON:** `docker compose up -d` to a new tag swaps the LIVE container BEFORE any health check — a broken image crash-loops production (**ratatoskr TTS down ~1-2min this session**). NEW PATTERN = build → test in a THROWAWAY container on an alt port (:8199) → health+verify → only THEN cut live over (redeploy2.sh). v2 LIVE + healthy on irv-ml1:8198, **CONSUMER-CONFIRMED clean** (ratatoskr verified end-to-end on their :8765 — apostrophe string reads clean, /api/tts 200 @ 48kHz, no client change; the ~1-2min blip didn't hit them, their concurrent auto-audio issue was client-side localStorage). **rollback = `sed DOTS_TAG=v1 + docker compose up -d dots-tts`** (v1 image retained). Also: deployed container GPU crept ~6→13.9GB over 8h serving (cache accumulation; a redeploy resets it — watch item). [[reference_chatterbox_fast_repo]]