v1.6.0 — security + claudebox v1.13.1 + reasoning/vision models + Piper TTS

Security
- litellm v1.83.5-nightly -> v1.83.14-stable.patch.2: fixes CVE-2026-42208
  (pre-auth SQL injection in API key verification, CVSS 9.3). Stable channel,
  cosign-signed. Post-supply-chain-incident v1.83.x line.
- redis 7.4.8-alpine -> 7.4.9-alpine: RCE/UAF CVEs disclosed 2026-05-05.
  Applied to both `redis` and `stealthy-auto-browse-redis`.

Claudebox
- psyb0t/claudebox v1.9.0-minimal -> v1.13.1-minimal (11 versions, mostly
  cron+telegram fixes irrelevant to aigate's CLAUDE_MODE_API=1 usage).
- v1.11.0 surfaces `opusplan` in /openai/v1/models — added claudebox-opusplan
  provider entry. claudebox-zai unchanged.

New local CUDA LLMs (4)
- local-ollama-cuda-phi4-reasoning-plus  — Phi-4 Reasoning Plus 14B+RL (~11GB)
- local-ollama-cuda-deepseek-r1-14b      — DeepSeek-R1-Distill-Qwen-14B (~9GB)
- local-ollama-cuda-qwen3-30b-a3b        — Qwen3 30B MoE / 3B active (~17GB)
- local-ollama-cuda-qwen2.5vl-7b         — Qwen2.5-VL 7B vision (~5GB)
- All four added to ollama-pull CUDA section for auto-download.

New local CPU Piper TTS models (17, 16 languages)
- Fills the multilingual TTS gap (Kokoro = English/Chinese-leaning,
  Qwen3-TTS needs CUDA and covers 10 langs).
- Multi-speaker (5): en_US-libritts-high (904), en_GB-vctk-medium (109),
  fr_FR-mls-medium, nl_NL-mls-medium, sv_SE-nst-medium — speaker via voice:"<id>"
- Single-speaker (12): de_DE-thorsten-high, es_ES-davefx-medium,
  it_IT-paola-medium, pl_PL-darkman-medium, pt_BR-faber-medium,
  ro_RO-mihai-medium, ru_RU-irina-medium, tr_TR-fahrettin-medium,
  uk_UA-ukrainian_tts-medium, vi_VN-vais1000-medium, zh_CN-huayan-medium,
  ar_JO-kareem-medium
- Served by existing speaches container (lazy-downloaded), no infra changes.

Fallback chains (5 chains in litellm/config/fallbacks.json)
- phi4-reasoning-plus -> deepseek-r1-14b -> deepseek-r1-8b -> qwen3-30b-a3b ->
  qwen3-8b -> hf-deepseek-r1 -> cerebras-qwen3-235b -> cpu-qwen3-4b
- deepseek-r1-14b -> phi4-reasoning-plus -> deepseek-r1-8b -> qwen3-30b-a3b ->
  qwen3-8b -> hf-deepseek-r1 -> cerebras-qwen3-235b -> cpu-qwen3-4b
- deepseek-r1-8b (updated) -> deepseek-r1-14b -> phi4-reasoning-plus ->
  qwen3-8b -> llama3.1-8b -> hf-deepseek-r1 -> cpu-qwen3-4b
- qwen3-30b-a3b -> qwen3-abliterated-16b -> qwen3-8b -> llama3.1-8b ->
  cerebras-qwen3-235b -> or-qwen3-80b -> mistral-large -> cpu-qwen3-4b
- qwen2.5vl-7b -> gemma4-e4b -> hf-qwen3-vl-8b -> hf-qwen-vl-72b ->
  groq-llama-4-scout -> hf-llama-4-scout -> openai-gpt-4o

Note: the actual git commit landed on main as "f" (04522c9) before this tag
was cut; full release notes live in this annotated tag.

No env var changes. No breaking changes.