chore: clean up open-model TTS plugins (Kokoro warmup, Pocket deps, drop moonshine extra)

[Nash0x7E2]

Why

The open-model (local, no-API-key) TTS plugins had drifted from the rest of the framework. Kokoro built its KPipeline eagerly in __init__, which blocked construction and meant the model load never participated in the agent warmup lifecycle; its example was a greet-once demo with no way to actually hold a conversation. Pocket still pinned an old pocket-tts and its example declared a smart-turn dependency it no longer needs (Deepgram STT provides turn detection). Separately, agents-core still advertised a moonshine optional-dependency extra even though that plugin no longer exists, so pip install vision-agents[moonshine] resolved to nothing.

This branch brings the local-model TTS plugins back in line with the framework's warmup lifecycle, makes their examples runnable end-to-end, and drops the dead extra.

Changes

• Kokoro TTS: load the KPipeline lazily through the Warmable mixin instead of in __init__, so the model is built once during agent warmup on a dedicated executor rather than blocking construction, and expand the unit tests to cover the warmup + synthesis path.
• Kokoro example: turn the greet-once demo into a full voice loop by adding Deepgram STT (eager turn detection) plus an opening greeting, and refresh the READMEs.
• Pocket: bump pocket-tts to >=1.1.1, relax the example to requires-python >=3.10, and drop the now-unused smart-turn dependency.
• Core: remove the stale moonshine optional-dependency extra from agents-core and regenerate uv.lock.

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• plugins/kokoro/README.md
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🚧 Files skipped from review as they are similar to previous changes (3)

• plugins/kokoro/README.md
• plugins/kokoro/tests/test_tts.py
• plugins/kokoro/vision_agents/plugins/kokoro/tts.py

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📝 Walkthrough

Walkthrough

The Kokoro TTS plugin now lazily initializes KPipeline through Warmable, generates chunks with a dedicated executor, and shuts down resources in close(). Tests cover injected pipelines, warmup handling, stream markers, and cleanup. Kokoro examples and documentation now reflect Vision Agents lifecycle usage and Deepgram STT. Pocket and optional dependency declarations were also updated.

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Actionable comments posted: 4

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📒 Files selected for processing (8)

• agents-core/pyproject.toml
• plugins/kokoro/README.md
• plugins/kokoro/example/README.md
• plugins/kokoro/example/kokoro_example.py
• plugins/kokoro/tests/test_tts.py
• plugins/kokoro/vision_agents/plugins/kokoro/tts.py
• plugins/pocket/README.md
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• agents-core/pyproject.toml