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/phase0_evidence/iter6_depth_run.txt

@@ -0,0 +1,57 @@
+iter6 depth-tested multi-draw probe — captured 2026-05-19 on ohm
+(PineTab2 v2.0, RK3566, Mali-G52 r1 MC1, Mesa 26.0.6, kernel 7.0.0-danctnix1-6)
+
+Source: panvk-bifrost/iter6/{probe_depth.c, .vert, .frag, Makefile}
+Deployed to: /tmp/panvk-iter6/
+
+===== RUN #1 (baseline) =====
+[step] vkCreateInstance
+WARNING: panvk is not a conformant Vulkan implementation, testing use only.
+[info] gpu='Mali-G52 r1 MC1'
+[info] D32_SFLOAT optimalTilingFeatures=0xd601
+[step] vkCreateDevice
+[step] vkCreateBuffer vertex buffer
+[step] vkCreateImage color attachment
+[info] color image memReq size=69632 align=4096
+[step] vkCreateImage depth attachment (D32_SFLOAT)
+[info] depth image memReq size=69632 align=4096
+[step] vkCreatePipelineLayout + shaders
+[step] vkCreateGraphicsPipelines
+[step] record cmd buffer (2 draws with depth)
+[step] submit + wait
+[step] verify
+[chk] (  0,  0) TL         expect=clear got=0x00000000  clear-ok
+[chk] (127,127) BR         expect=clear got=0x00000000  clear-ok
+[chk] ( 64, 64) center     expect=green got=0xff00ff00  green-ok
+[chk] ( 64, 30) above-B    expect=red   got=0xff0000ff  red-ok
+[chk] ( 64,100) below-B    expect=red   got=0xff0000ff  red-ok
+[info] coverage: red=3850 green=1352 clear=11182 other=0 (total 16384)
+[PASS] depth-tested multi-draw works.
+
+===== KEY OBSERVATIONS =====
+
+1. D32_SFLOAT optimalTilingFeatures = 0xd601:
+     bit 0  (0x0001) SAMPLED_IMAGE
+     bit 9  (0x0200) DEPTH_STENCIL_ATTACHMENT  ✓
+     bit 10 (0x0400) BLIT_SRC
+     bit 12 (0x1000) SAMPLED_IMAGE_FILTER_LINEAR
+     bit 14 (0x4000) TRANSFER_SRC
+     bit 15 (0x8000) TRANSFER_DST
+
+2. Memory:
+     color image memReq = 69632 (17 pages)  — 16 raw + 1 aux
+     depth image memReq = 69632 (17 pages)  — same overhead for D32
+     128*128*4 = 65536 = 16 pages raw pixel data
+
+3. Coverage accounting:
+     Triangle A (red, large): NDC area 1.28 / 4 = 32% = ~5243 pixels expected
+     Triangle B (green, small, inside A): NDC area 0.32 / 4 = 8% = ~1310 pixels expected
+     Got: red=3850, green=1352
+     Sum non-clear: 5202 ≈ A's total area (B occludes part of A in depth)
+     other=0 — no banding, no z-fighting, no interpolation artifacts.
+
+4. Depth test correct:
+     Pixel (64, 64) is inside both triangles. B's z=0.3 < A's z=0.7,
+     LESS comparison selects B → green wins. Confirmed at (64, 64).
+
+5. No GPU faults, no validation warnings, deterministic across reruns.