[Kyle-Ye]

SwiftUI virtual nodes were serialized through the native-object identifier path, so every node without a UIView/CALayer appeared as 0x0. A caller could not reliably address individual Text nodes, and custom-only attribute groups were incorrectly reported as uncached.

Use the deferred detail oid when available, the existing SwiftUI handle for older inline payloads, and a separate host-local namespace for other custom nodes. Hierarchy serialization and lookup now share this mapping. read_view_details returns older inline details without sending an invalid RPC 203, while read_attributes recognizes custom groups and fetched empty groups as cached.

Identifiers remain scoped to the current hierarchy; clients must rediscover nodes after a refresh.

Validation

• Host build and Scripts/test-mcp-bridge.sh passed, including a run with PATH=/usr/bin:/bin:/usr/sbin:/sbin. The script uses system find so CI does not require ripgrep.
• Regression coverage exercises 105 virtual nodes, deferred and legacy inline IDs, generic custom nodes, native IDs and cache state.
• iPhone 17 / iOS 27 end-to-end: all 117 detailed-mode nodes and all 30 compact-mode nodes had unique nonzero identifiers.
• All seven Text nodes succeeded through read_view_details with no failed identifiers, and subsequent read_attributes calls reported detailsCached: true.

Related changes

• Text font and color projection: https://github.com/LookInsideApp/LookInside-Server/pull/22
• MCP identifier and prefetch descriptions: https://github.com/LookInsideApp/LookInside-MCP/pull/3