Enhanced Insights with daily summary embeddings

Bump to 0.5.0. Added daily summary generation job

migrations/2026-01-04-000000_add_message_embeddings/down.sql

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+-- Drop tables in reverse order
+DROP TABLE IF EXISTS vec_message_embeddings;
+DROP TABLE IF EXISTS message_embeddings;

migrations/2026-01-04-000000_add_message_embeddings/up.sql

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+-- Table for storing message metadata and embeddings
+-- Embeddings stored as BLOB for proof-of-concept
+-- For production with many contacts, consider using sqlite-vec extension
+CREATE TABLE message_embeddings (
+    id INTEGER PRIMARY KEY NOT NULL,
+    contact TEXT NOT NULL,
+    body TEXT NOT NULL,
+    timestamp BIGINT NOT NULL,
+    is_sent BOOLEAN NOT NULL,
+    embedding BLOB NOT NULL,
+    created_at BIGINT NOT NULL,
+    model_version TEXT NOT NULL,
+    -- Prevent duplicate embeddings for the same message
+    UNIQUE(contact, body, timestamp)
+);
+
+-- Indexes for efficient queries
+CREATE INDEX idx_message_embeddings_contact ON message_embeddings(contact);
+CREATE INDEX idx_message_embeddings_timestamp ON message_embeddings(timestamp);