Veridge 0.7.4

A setup diagnostic. No engine changes — the graph, queries and zero-dependency core are identical
to 0.7.3.

New

veridge doctor — a read-only check that answers "is Veridge wired up correctly here?" in
one command: index built, the [mcp]/[treesitter] extras present, and the MCP server + steering
note registered for Claude and Codex. It prints the exact next command for anything missing
(e.g. run veridge integrate codex), and exits non-zero only when there's no index — so it's
scriptable. --json for machine-readable output.

It checks the project files that configure MCP, not the assistant's running client (Veridge
can't see that), and reminds you that the veridge CLI is always the fallback — every MCP tool
has a CLI twin. Handy onboarding for repos where Claude and Codex work together.