[#92 Class C] comms-mcp: missing GmailResource + CalendarResource enums in Zig FFI

[hyperpolymath]

Problem

cartridges/comms-mcp/abi/CommsMcp/SafeComms.idr declares two enums that cartridges/comms-mcp/ffi/comms_ffi.zig does not implement:

[enum-missing-in-zig] manifest declares enum \`GmailResource\` but the Zig FFI has no \`pub const GmailResource = enum(c_int)\` declaration
[enum-missing-in-zig] manifest declares enum \`CalendarResource\` but the Zig FFI has no \`pub const CalendarResource = enum(c_int)\` declaration

Same shape as boj-server#102 (007-mcp ToolRisk).

Fix shape (in boj-server)

Add the two enum declarations to comms_ffi.zig, mirroring SafeComms.idr. Wire transition switches if declared.

Acceptance criteria

iseriser abi-verify returns exit 0 on comms-mcp. Add to boj-server#110 allowlist.

Parent #92.
Refs #89.

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