Retire MPE scaffold; stand up reaper_reasampler pure-core skeleton

Rename CMake project/module to reaper_reasampler, delete mpe_model/mpe_view,
add minimal pure bank_model lib + placeholder CTest. main.cpp loads, logs to
console, keeps the action-registration seam commented with the forever-stable
CEREBELLUM_REASAMPLER_ action-id prefix.

tests/test_bank_model.cpp

@@ -0,0 +1,24 @@
+// Standalone tests for reasampler::bank_model — no REAPER, no test framework.
+// This is the point of splitting the model out: iterate the hard logic here with
+// a fast build/run loop instead of restarting REAPER.
+//
+// Milestone 0 placeholder: a single assertion proving the pure lib links and
+// runs under CTest. The real round-trip / dedup / tier / relative-path tests
+// arrive with the Milestone 1 data model (see TODO.md, PLAN.md).
+
+#include "../src/bank_model.h"
+#include <cstdio>
+
+using namespace reasampler;
+
+static int g_fail = 0;
+#define CHECK(cond) do { if(!(cond)) { \
+    std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)
+
+int main()
+{
+    CHECK(bankModelVersion() == 1);
+
+    if (g_fail == 0) std::printf("All tests passed.\n");
+    return g_fail ? 1 : 0;
+}