codedb mcp <path> hangs on loading_snapshot. Correct syntax is codedb <path> mcp

[Elesiann]

Bug

Running codedb mcp /path/to/project hangs indefinitely with scan=loading_snapshot files=0.

Root cause

isCommand() in main.zig:1072 includes "mcp" in its command list. So when called as
codedb mcp /path, the parser hits the isCommand(args[1]) branch at line 147, sets
root="." and cmd="mcp", and the path argument is silently ignored.

With root="." and root_is_explicit=false, the condition at line 227 evaluates to true:

const mcp_deferred_root = std.mem.eql(u8, cmd, "mcp") 
    and std.mem.eql(u8, root, ".") 
    and !root_is_explicit;

This triggers the deferred scan flow that waits for a roots/list MCP message —
which never arrives when running outside a MCP client, so the server hangs forever
at loading_snapshot.

Reproduction

codedb mcp /home/user/myproject
# → scan=loading_snapshot files=0  (hangs forever)

codedb /home/user/myproject mcp
# → scan=ready files=433  (works)

Fix

Two options:

1. Fix the README to document the correct syntax: codedb <path> mcp
2. Or handle both arg orderings in the parser — if args[1] == "mcp" and args[2]
   looks like a path, treat it as the root

Workaround: CODEDB_ROOT=/path codedb mcp also works.