Add Context Manager client and log schema

- context_manager.py: Full stateless client for Anthropic API
  - Builds context from cto.blocks + cto.memory + log.messages
  - Logs all messages to immutable log.messages table
  - Interactive chat mode with CLI commands

- context_bridge.py: PostgreSQL bridge for context queries
  - Peer auth support for local connections
  - get_all_relevant_blocks() single query optimization
  - build_system_prompt() from blocks

- 04_log.sql: Immutable log schema
  - log.messages with hash chain integrity
  - Triggers preventing UPDATE/DELETE

- 07_initial_blocks.sql: Initial context blocks
  - tzzr_base, rules_base, r2_storage
  - server_architect, server_deck, server_corp

- cm: Launcher script with venv support

cm

@@ -0,0 +1,14 @@
+#!/bin/bash
+# Context Manager CLI
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo "CONTEXT MANAGER - TZZR"
+echo "======================"
+
+# Activar venv si existe
+if [ -d "$SCRIPT_DIR/venv" ]; then
+    source "$SCRIPT_DIR/venv/bin/activate"
+fi
+
+# Ejecutar
+exec python3 "$SCRIPT_DIR/context_manager.py" "$@"