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/iter3_triangle_run.txt

@@ -0,0 +1,77 @@
+iter3 fullscreen triangle 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/iter3/{probe_triangle.c, probe_triangle.vert, probe_triangle.frag, Makefile}
+Deployed to: /tmp/panvk-iter3/
+Build: clean
+
+===== RUN #1 (no validation layer) =====
+$ PAN_I_WANT_A_BROKEN_VULKAN_DRIVER=1 ./probe_triangle
+
+[step] vkCreateInstance (+VK_KHR_get_physical_device_properties2)
+[step] vkEnumeratePhysicalDevices
+WARNING: panvk is not a conformant Vulkan implementation, testing use only.
+[info] gpu='Mali-G52 r1 MC1' apiVersion=1.0.335
+[step] vkCreateDevice (+dynamic_rendering chain)
+[step] vkCreateImage (64x64 R8G8B8A8_UNORM, COLOR_ATTACHMENT|TRANSFER_SRC)
+[info] image memReq size=20480 alignment=4096
+[step] vkCreateImageView
+[step] vkCreatePipelineLayout + shaders
+[step] vkCreateGraphicsPipelines
+[step] record (dynamic rendering + draw + copy)
+[step] submit + wait (10s)
+[step] invalidate + verify
+[info] mismatches=0/4096 sentinel=0 cleared_black=0
+[PASS] PanVk-Bifrost triangle: all 4096 pixels match.
+===== RC=0 =====
+
+===== RUN #2 (VK_LAYER_KHRONOS_validation) =====
+[same step trace; no validation warnings/errors]
+[info] mismatches=0/4096 sentinel=0 cleared_black=0
+[PASS]
+===== RC=0 =====
+
+===== STABILITY: 5 consecutive reruns =====
+[info] mismatches=0/4096 sentinel=0 cleared_black=0   [PASS]
+[info] mismatches=0/4096 sentinel=0 cleared_black=0   [PASS]
+[info] mismatches=0/4096 sentinel=0 cleared_black=0   [PASS]
+[info] mismatches=0/4096 sentinel=0 cleared_black=0   [PASS]
+[info] mismatches=0/4096 sentinel=0 cleared_black=0   [PASS]
+
+7/7 runs PASS, all 4096 pixels per run match the expected gl_FragCoord encoding.
+
+===== KEY OBSERVATIONS =====
+
+1. Device-extension chain enables cleanly with all 5 KHRs:
+     VK_KHR_multiview
+     VK_KHR_maintenance2
+     VK_KHR_create_renderpass2
+     VK_KHR_depth_stencil_resolve
+     VK_KHR_dynamic_rendering
+   plus instance VK_KHR_get_physical_device_properties2 and
+   VkPhysicalDeviceDynamicRenderingFeaturesKHR.dynamicRendering = VK_TRUE.
+
+2. Image memReq for 64×64 RGBA8 COLOR_ATTACHMENT|TRANSFER_SRC:
+     size      = 20480 (5 pages)
+     alignment = 4096
+   Raw pixel data: 64*64*4 = 16384 bytes (4 pages).
+   The extra page is Mali tile state / AFBC metadata / aux tiling structures
+   that PanVk allocates alongside the color attachment.
+
+3. Pixel-position encoding round-trips exactly:
+     (0,0)         -> 0xff800000   ✓
+     (63,0)        -> 0xff80003f   ✓
+     (0,63)        -> 0xff803f00   ✓
+     (63,63)       -> 0xff803f3f   ✓
+     (32,32)       -> 0xff802020   ✓
+     (all 4096)    -> exact match
+   gl_FragCoord.xy in pixel-center coords (+0.5) → uvec2 floor gives exact
+   pixel index. Vulkan's top-left origin honored. No off-by-half, no Y-flip.
+
+4. Bifrost tile binning works:
+     16×16 tile size × 64×64 image = 16 tiles (4×4 grid)
+     Each tile flushed cleanly; no missing tile, no swapped tiles, no
+     tile-coverage gap at boundaries.
+
+5. No GPU faults, no MMU faults, no kernel-side panfrost messages
+   across all 7 runs.