Gate Orchestra behind Nucleic Control; lavender Home composer accent

Orchestra is a Nucleic Control capability now:
- Core: SessionController withholds the fan-out consent unless the session's project
  is under Control (resolvedEffort still maps the sentinel to xhigh, so a stray
  selection never reaches a backend verbatim). Covered by a new SessionController test.
- macOS: the effort menu shows Orchestra disabled with a 'Requires Nucleic Control'
  note + tooltip off-control; effectiveEffort demotes a carried-over selection so the
  label/glow never show it active where it can't run.
- Home composer themes lavender (the Control accent) for a Control project — the
  Auto/Merge accents and a persistent ring on the field, tracking the project picker.
- Remote: WireProject carries isNucleicControlled (decode-tolerant) so the iOS effort
  picker gates Orchestra the same way.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

NucleicRemote/NucleicRemote/Views/ProjectsView.swift

@@ -60,13 +60,13 @@ struct ProjectDetailView: View {
             Section {
                 VStack(alignment: .leading, spacing: 8) {
                     HStack {
-                        EffortMenu(effort: $effort)
+                        EffortMenu(effort: $effort, controlled: project.isNucleicControlled)
                         Spacer()
                     }
                     HStack(alignment: .bottom, spacing: 8) {
                         TextField("Start a chat in \(project.name)…", text: $draft, axis: .vertical)
                             .textFieldStyle(.roundedBorder).lineLimit(1...4)
-                            .orchestraGlow(active: MobileEfforts.isOrchestra(effort))
+                            .orchestraGlow(active: MobileEfforts.isOrchestra(effort) && project.isNucleicControlled)
                         Button {
                             store.startChat(in: project.id, message: draft, effort: effort)
                             draft = ""