Merge pull request 'elp: native audio/image efferent surfaces + projector proof-of-shape' (#111) from worktree-agent-aaf04b0a9714c4070 into dev

elp/tests/examples/surface-profile-demo.el

@@ -0,0 +1,26 @@
+// surface-profile-demo.el - ONE SemFrame, realized ONCE, projected to THREE
+// surfaces via surface profiles. Proves surface-as-profile natively: the frame
+// and the realized sentence are identical; only the surface PROFILE differs.
+
+fn demo() -> String {
+    // 1. The shared frame (meaning-geometry): assert(Neuron, contain, the memory).
+    let frame: [String] = sem_frame("assert", "Neuron", "the memory", "")
+
+    // 2. REALIZE once via the EXISTING native realizer (language = a profile).
+    let sentence: String = sem_realize(frame)
+
+    // 3. PROJECT the same realized sentence onto three surfaces (surface = a
+    //    profile). Same frame, same sentence, different surface — one render.
+    let heading: String = "Memory"
+    let md: String   = surface_section(surface_profile_markdown(), heading, sentence)
+    let html: String = surface_section(surface_profile_html(), heading, sentence)
+    let plain: String = surface_section(surface_profile_plain(), heading, sentence)
+
+    // 4. Report the non-text seam: a surface profile can declare an audio/image
+    //    medium; the render dispatches to the medium projector on the SAME frame.
+    let midi_media: String = surface_get(surface_profile_midi(), "media_type")
+
+    return "MD=[" + md + "] HTML=[" + html + "] PLAIN=[" + plain + "] MIDI_MEDIA=" + midi_media
+}
+
+println(demo())