initial seed: retrofit campaign lineage from local working trees

panvk-bifrost campaigns (r1..r4 Vulkan compositor + r5.video1 Vulkan
video decode) shipped before this repo existed; the deliverable
patches live in marfrit-packages, but the reasoning chain, phase docs,
and source-state evidence lived only in local working trees on the
development host.

This retrofit imports:
- mesa-panvk-bifrost/   — r1..r4 era phase docs (iter1..iter18)
                          (libmali stub blobs at iter18/blob/ excluded
                          — 109MB of RE artifacts replaced with a README
                          pointer)
- mesa-panvk-bifrost-video/ — sibling campaign phase docs + probe
- evidence/             — frozen .tgz source snapshots at each milestone
                          (basis for the 0005 patch diff generation)

Future iterations should branch off here from day one, so each iter is
a commit rather than a snapshot. See [[feedback-session-local-process-pins]]
for the process drift this retrofit closes.

Total: 1.9 MB across 124 files.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

mesa-panvk-bifrost/iter1/probe_compute.comp

@@ -0,0 +1,17 @@
+#version 450
+
+// iter1 minimal compute probe — writes a known pattern to a storage buffer.
+// Single workgroup, single invocation. The simplest possible compute workload.
+//
+// Result: data[0] = 0xCAFEBABE
+// Anything else (or no write at all, or a hang, or a GPU fault) is a finding.
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+
+layout(set = 0, binding = 0, std430) buffer Out {
+    uint data[];
+};
+
+void main() {
+    data[0] = 0xCAFEBABEu;
+}