Add `lore query` CLI subcommand for read-side parity

[jafreck]

Problem

The CLI surface is write-only (index, refresh, hooks, ingest-coverage, mcp). All 17 MCP query tools have no CLI equivalent. Users and scripts cannot query the knowledge base without spinning up an MCP server and connecting a client.

Proposal

Add a lore query <tool-name> [--json '{ ... }'] subcommand that dispatches directly to MCP tool handlers.

lore query lore_code_search --db lore.db --json '{"query": "auth middleware", "mode": "fused"}'
lore query lore_git_blame --db lore.db --json '{"path": "src/server.ts", "mode": "ownership"}'
lore query lore_metrics --db lore.db --json '{"mode": "aggregate"}'

Implementation notes

• ToolRegistry already maps tool names → handler factories. This subcommand needs ~50 lines: open DB read-only, instantiate ToolDependencies, look up the handler by name, parse --json args, call it, print JSON to stdout.
• Output to stdout as JSON for piping; errors to stderr.
• lore query --list prints available tool names.
• Tool names should match the renamed tools from Namespace MCP tools with domain prefixes for discoverability #152.

Acceptance criteria

• lore query <tool> --db <path> --json '{...}' calls the named tool handler and prints JSON to stdout
• lore query --list prints all registered tool names
• Error on unknown tool name with helpful message
• Documented in --help output