feat(P01-02-01): service interfaces — TTSProvider, LLMProvider, Guardrail
server/services/base.py defines three abstract base classes with type
annotations: TTSProvider (async synthesize/synthesize_all, voice_id), LLMProvider
(async chat/chat_full, roleplay_model, debrief_model), Guardrail (async check,
session_start_disclaimer). GuardrailVerdict/Context/TTSResult/LLMStreamChunk
dataclasses carry typed metadata. server/services/registry.py resolves the
active adapter from env (PRAXIS_TTS, PRAXIS_GUARDRAIL) so the pipeline never
imports a concrete adapter directly — D-014/D-019/D-020 swap wiring. Verified:
'from server.services import TTSProvider, LLMProvider, Guardrail' succeeds.
---ci---
phase: 1
milestone: v0.1
plan: 02
task: 02-01
status: execute
persona: backend-engineer
requirements:
covered: [REQ-VOICE-02, REQ-LLM-01, REQ-ORCH-02]
---/ci---
Praxis CI
47e24dbe59