fix: feedback MCP tool schema says 'rating' but handler expects 'quality'

[CalebisGross]

Problem

The feedback tool definition in internal/mcp/tools.go defines the parameter as rating, but handleFeedback in server.go reads the field quality. This causes a confusing round-trip:

1. Agent calls feedback({rating: "helpful"}) per the schema
2. Handler returns error: "quality parameter is required"
3. Agent has to guess the correct param name

Fix

Either rename the schema param from rating to quality, or update the handler to accept rating. Schema should match handler.

[CalebisGross]

Not a code bug — the schema correctly uses quality in both the tool definition (tools.go:396) and the handler (server.go:1809). The issue was stale deferred tool metadata in Claude Code's ToolSearch cache, which showed rating instead of quality. Restarting the MCP session resolved it.