Reconnect named-session lookup to resume flows

[shiny-code-bot]

Finish Line

Resume and fork by session name use the recovered state-db-first named-session lookup, including legacy-index repair and stale-candidate verification, without retaining the weaker duplicate paging implementation.

Current Status

named_session_lookup.rs has seven focused behavioral tests and live archive-selection types, but its main lookup path is orphaned. lib.rs still calls a weaker duplicate app-server paging function.

Acceptance Criteria

• Route resume/fork name resolution through named_session_lookup::lookup.
• Remove the duplicate weaker lookup implementation.
• Preserve ID-based resume/fork behavior.
• Existing named-session lookup tests become production-path coverage and pass.
• Exact Bazel Clippy clears the named-session diagnostics.

Relationships

• Second implementation stage of Restore TUI reachability for exact Bazel Clippy #685.

Open Questions

• None.