Phase 1 foundation: Tauri shell, Python sidecar, SQLite database

Tauri v2 + Svelte + TypeScript frontend:
- App shell with workspace layout (waveform, transcript, speakers, AI chat)
- Placeholder components for all major UI areas
- Typed stores (project, transcript, playback, AI)
- TypeScript interfaces matching the database schema
- Tauri bridge service with typed invoke wrappers
- svelte-check passes with 0 errors

Rust backend:
- Tauri v2 app entry point with command registration
- SQLite database layer (rusqlite with bundled SQLite)
  - Full schema: projects, media_files, speakers, segments, words,
    ai_outputs, annotations (with indexes)
  - Model structs with serde serialization
  - CRUD queries for projects, speakers, segments, words
  - Segment text editing preserves original text
  - Schema versioning for future migrations
  - 6 tests passing
- Command stubs for project, transcribe, export, AI, settings, system
- App state management

Python sidecar:
- JSON-line IPC protocol (stdin/stdout)
- Message types: IPCMessage, progress, error, ready
- Handler registry with routing and error handling
- Ping/pong handler for connectivity testing
- Service stubs: transcribe, diarize, pipeline, AI, export
- Provider stubs: local (llama-server), OpenAI, Anthropic, LiteLLM
- Hardware detection stubs
- 14 tests passing, ruff clean

Also adds:
- Testing strategy document (docs/TESTING.md)
- Validation script (scripts/validate.sh)
- Updated .gitignore for Svelte, Rust, Python artifacts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

python/voice_to_notes/ipc/messages.py

@@ -0,0 +1,46 @@
+"""IPC message type definitions."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass
+class IPCMessage:
+    """A message exchanged between Rust and Python via JSON-line protocol."""
+
+    id: str
+    type: str
+    payload: dict[str, Any] = field(default_factory=dict)
+
+    def to_dict(self) -> dict[str, Any]:
+        return {"id": self.id, "type": self.type, "payload": self.payload}
+
+    @classmethod
+    def from_dict(cls, data: dict[str, Any]) -> IPCMessage:
+        return cls(
+            id=data.get("id", ""),
+            type=data.get("type", ""),
+            payload=data.get("payload", {}),
+        )
+
+
+def progress_message(request_id: str, percent: int, stage: str, message: str) -> IPCMessage:
+    return IPCMessage(
+        id=request_id,
+        type="progress",
+        payload={"percent": percent, "stage": stage, "message": message},
+    )
+
+
+def error_message(request_id: str, code: str, message: str) -> IPCMessage:
+    return IPCMessage(
+        id=request_id,
+        type="error",
+        payload={"code": code, "message": message},
+    )
+
+
+def ready_message() -> IPCMessage:
+    return IPCMessage(id="system", type="ready", payload={"version": "0.1.0"})