refactor: replace custom HTTP client with official MCP SDK

Deleted custom HTTP test scripts and replaced with proper MCP client
using streamablehttp_client from official SDK.

Deleted:
- start_http_server.sh (custom server wrapper)
- test_http_agentic.sh (bash HTTP client)
- test_http_agentic_tools.py (custom SSE parser)

Added:
- test_http_mcp.py - Uses mcp.client.streamable_http.streamablehttp_client
- Properly follows MCP protocol
- No manual SSE parsing or session management
- Same test cases as STDIO version

Usage:
  pip install mcp python-dotenv
  python3 test_http_mcp.py

Author: jruokola

.gitignore

@@ -180,3 +180,4 @@ SESSION-MEMORY.md
 .serena/
 .codegraph.toml
 /test_output/
+/test_output_http/