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/iter13/Makefile

@@ -0,0 +1,39 @@
+# iter13 XFB probe — build glue.
+
+CC ?= cc
+CFLAGS ?= -O0 -g -Wall -Wextra -std=c11
+LDLIBS ?= -lvulkan
+
+PROBE = probe_xfb
+NOPROBE = probe_xfb_nodraw
+SRC   = probe_xfb.c
+NOSRC = probe_xfb_nodraw.c
+VERT  = probe_xfb.vert
+VSPV  = probe_xfb.vert.spv
+
+all: $(PROBE) $(NOPROBE) $(VSPV)
+
+$(PROBE): $(SRC)
+	$(CC) $(CFLAGS) -o $@ $< $(LDLIBS)
+
+$(NOPROBE): $(NOSRC)
+	$(CC) $(CFLAGS) -o $@ $< $(LDLIBS)
+
+# glslangValidator + xfb-aware compile. The -V flag enables Vulkan SPIR-V output.
+# xfb_buffer / xfb_offset / xfb_stride decorations are honored when the SPIR-V
+# is targeted at Vulkan (which is the default for -V).
+$(VSPV): $(VERT)
+	glslangValidator -V $< -o $@
+
+run: all
+	PAN_I_WANT_A_BROKEN_VULKAN_DRIVER=1 ./$(PROBE)
+
+run-patched-mesa: all
+	VK_ICD_FILENAMES=/usr/lib/panvk-bifrost/icd.json \
+	PAN_I_WANT_A_BROKEN_VULKAN_DRIVER=1 \
+	./$(PROBE)
+
+clean:
+	rm -f $(PROBE) $(VSPV)
+
+.PHONY: all run run-patched-mesa clean