refactor(mcp): migrate stdlib imports to core/go primitives + upgrade go-sdk v1.5.0
- Replace fmt/errors/strings/path/filepath with core.Sprintf, core.E,
core.Contains, core.Path etc. across 16 files
- Remove 'errors' import from bridge.go (core.Is/core.As)
- Remove 'fmt' from transport_tcp.go, ide.go (core.Print, inline interface)
- Remove 'strings' from notify.go, transport_http.go, tools_webview.go,
process_notifications.go (core.Trim, core.HasPrefix, core.Lower etc.)
- Upgrade go-sdk from v1.4.1 to v1.5.0
- Keep encoding/json for json.NewDecoder/MarshalIndent (no core equivalent)
- Keep os/exec in agentic subsystem (needs go-process Action wiring)
Co-Authored-By: Virgil <virgil@lethean.io>
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