Campaign-contained data discipline + repo notice

Operator directive 2026-05-03: this campaign acquires all its
own measurement data from scratch. Predecessor numbers are
documented for context but never imported as binding cells,
comparison targets, or success thresholds. The lesson the
predecessor (kwin_overlay_subsurface) closed-without-patch on
is exactly that: phase 1 cells anchored to a single historical
ohm_gl_fix Phase 0 measurement, three weeks of phase planning
on a baseline that didn't reproduce in-session.

The strongest version of feedback_replicate_baseline_first.md:
"don't import predecessor data, acquire it fresh." The discipline
is now documented as a governing rule in three places:

- README.md § "Campaign-contained data discipline"
- phase0_findings.md § "Campaign-contained data discipline
  (governing rule)"
- worklist.md § "Governing rule (every phase)"

Concrete consequences:
- A1 baseline (Phase 0 task) is now mandatory at N=3 reps.
  Single-rep wasn't enough to surface session variance in the
  predecessor; doing 3 up front makes the baseline robust to
  the same kind of session-state drift that ate the
  predecessor's premise.
- Phase 1 thresholds are drawn against the A1 baseline measured
  in this campaign, not against any predecessor number.
- metrics.csv (when it lands) only carries data from this
  campaign's reps. No predecessor rows imported.

README.md additionally:
- Adds the predecessor chain (ohm_gl_fix -> kwin_overlay_subsurface
  -> this campaign) with explicit "what stays valid for source-
  reading" vs "numbers that don't" separation.
- Calls out durable substrate available from predecessors:
  KWin scanout-promotion archaeology, measurement-protocol
  template, WAYLAND_DEBUG parser. All structural; none
  measurement-numerical.
- Carry-over predecessor system state on ohm (governor pin,
  baloo disabled, fourier packages) is explicitly distinguished
  from measurement data. System state inherits; data does not.
- Repository line points to the gitea remote
  ssh://gitea@git.reauktion.de:2222/marfrit/x11-session-research.git

phase0_findings.md additionally:
- Reframes the predecessor-close-out summary section header to
  "(context, not data)" and rephrases past-tense numbers so
  none are stated as "the baseline."
- Adds the discipline lesson narrative in-line before the
  predecessor close-out: a 30-minute N=3 same-session baseline
  on day 1 of the predecessor would have made the campaign
  different — and that's the move this campaign starts with.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -5,7 +5,8 @@
 > "Research question (LOCKED 2026-05-03)". Phase 1 still
 > requires the four pre-question Phase 0 deliverables
 > (state snapshot, X11 path inventory, browser-overlay-path
-> inventory, baseline anchor) before binding cells lock.
+> inventory, **own** baseline anchor) before binding cells
+> lock.
 
 **Research question:** Does cutting out the KWin compositor
 enable faster video display of Brave, chromium-fourier, and
@@ -27,35 +28,117 @@ The matrix is 3 browsers × 2 decode paths × 2 sessions = 12
 cells (some N/A where libva isn't supported). See
 `phase0_findings.md` for the full table.
 
-## Predecessor
+## Campaign-contained data discipline
 
-This campaign exists because
+**This campaign acquires all its own measurement data from
-[`../kwin_overlay_subsurface/`](../kwin_overlay_subsurface/)
+scratch in this session. Numbers, baselines, and verdict
-closed 2026-05-03 without patch (`phase8_handover.md`). Its
+thresholds from predecessor campaigns are NEVER imported as
-diagnostic loop terminated at "Phase 0 cage = 0 post-warmup
+binding cells, comparison targets, or success criteria.**
-drops floor not reproducible at N=3." The natural next move
-across the design surface is to vary the display server (X11
-instead of Wayland) on the same hardware and the same client
-binary, but the operator has not yet confirmed that as the
-campaign's specific question.
 
-## Hardware target (provisional, same as predecessor)
+Predecessor campaigns are documented for *context* — what
+question was asked, what file:line pointers stay valid for
+source-reading, what tooling/state on ohm carries over. But
+their *measurement numbers* (drop counts, perf percentages,
+Δ_present medians, kwin %CPU values) **are reference history
+only, not data this campaign relies on**.
+
+The discipline lesson is concrete:
+[`../kwin_overlay_subsurface/phase8_handover.md`](../kwin_overlay_subsurface/phase8_handover.md)
+closed 2026-05-03 without patch because its Phase 1 binding
+cells were anchored to a single historical measurement
+(`ohm_gl_fix` Phase 0: cage = 7 drops total / 0 post-warmup).
+That baseline was treated as a stable property of the
+hardware × software stack and the campaign's whole phase
+plan was built around closing the gap to it. When the same
+condition was re-measured at N=3 in the closing session of
+the campaign, none of the three reps reached 0 post-warmup
+drops; the median was 26. The campaign's premise didn't
+hold up to in-session replication, three weeks of phase
+planning ended at Phase 8 close-out, and the lesson is now
+[`feedback_replicate_baseline_first.md`](../kwin_overlay_subsurface/.claude/projects/-home-mfritsche-src-kwin-overlay-subsurface/memory/feedback_replicate_baseline_first.md)
+in this session's memory.
+
+This campaign acts on that lesson by stronger discipline:
+
+- Every Phase 1 binding cell anchors to data acquired in
+  this campaign's session.
+- Predecessor *measurements* never appear in
+  `metrics.csv`. Predecessor *file:line source-reads,
+  protocol designs, parser scripts* may be referenced or
+  re-used as durable substrate.
+- The Phase 0 "A1 baseline" rep is not optional. It is the
+  Wayland-with-KWin reference rep acquired at the start of
+  this campaign, against which the X11 cells of the matrix
+  will be compared. The predecessor's matching numbers are
+  not used as a substitute even if they look identical.
+- If a measurement instrument behaved one way in a
+  predecessor campaign, that behavior is re-verified here
+  before being relied on (see Phase 0 X11 measurement-tool
+  inventory).
+
+If a measurement in this campaign happens to match a
+predecessor's number, that's a useful corroboration of
+reproducibility — but it cannot substitute for in-session
+acquisition.
+
+## Predecessor campaigns
+
+This campaign is the third in a chain on the same hardware
+target:
+
+1. [`../ohm_gl_fix/`](../ohm_gl_fix/) — closed 2026-05-02.
+   Diagnosed and patched the Step 1 (`libva-v4l2-request`)
+   and Step 2 (Chromium `WaylandBufferManagerHost`
+   overlay-route) issues. Spun off the Wayland-compositor-
+   path question into a separate campaign because that
+   question had a different code surface, upstream, and
+   reviewer culture.
+2. [`../kwin_overlay_subsurface/`](../kwin_overlay_subsurface/)
+   — closed 2026-05-03 without patch
+   (`phase8_handover.md`). Diagnostic loop terminated at
+   "Phase 0 cage = 0 post-warmup drops floor not
+   reproducible at N=3" — the inherited baseline turned
+   out to be N=1 historical and didn't replicate in-session.
+3. **This campaign** (`x11-session-research`) — opened
+   2026-05-03. Tests whether bypassing the KWin compositor
+   via X11 + non-compositing WM avoids the forced
+   NV12 → RGB GL-composite step the predecessor identified
+   as a structural Wayland constraint on rockchip-drm.
+
+Durable substrate from the predecessors that this campaign
+*may* read (not import-as-data):
+
+- `kwin_overlay_subsurface/phase2_source_findings.md` —
+  KWin scanout-promotion archaeology (Plane 39 / Plane 45
+  format/modifier table on rockchip-drm RK3568); Phase 2-prime
+  Shape C source-read of `Display::dispatchEvents` and
+  `TransactionFence` (Wayland-side, doesn't transfer to X11
+  but illustrates the per-frame dispatch shape).
+- `kwin_overlay_subsurface/phase3_protocol_prime.md` — the
+  measurement-protocol structure (operator-vs-Claude split,
+  pre-registered hypothesis, falsification table, evidence
+  layout). The structural template is reusable. The specific
+  numbers and threshold values **are not**.
+- `kwin_overlay_subsurface/scripts/wayland_debug_to_csv.py` —
+  parser for libwayland WAYLAND_DEBUG output. Useful for the
+  Wayland cells of this campaign's matrix; an X11 equivalent
+  is yet-to-build.
+
+## Hardware target (same as predecessors)
 
 ohm — PineTab2, Rockchip RK3568 (4× Cortex-A55, Mali-G52 MP2,
 hantro G1/G2 VPU). Kernel `6.19.10-danctnix1-1-pinetab2`.
 Mesa 26.0.5. Currently runs KDE Plasma 6.6.4 Wayland.
 
-For an X11-session campaign, ohm needs an Xorg + Plasma X11 (or
+For an X11-session campaign, ohm needs an Xorg + non-compositing
-similar X11 desktop) install path verified. As of 2026-05-03,
+WM install path verified. As of 2026-05-03, the only confirmed
-the only confirmed display path on ohm is
+display path on ohm is `startplasma-wayland`. Phase 0 inventory
-`startplasma-wayland`. **Whether Plasma X11, an alternate X11
+will catalog what's installed, what'd need installing, and
-desktop (XFCE, openbox, lightweight WM), or Plasma running
+what SDDM-advertised sessions exist.
-under a Wayland-Xorg shim is in scope is part of the research
-question to be locked.**
 
-## Carry-overs from predecessor (still active on ohm)
+## Carry-overs from predecessor (system state, not data)
 
-Per `kwin_overlay_subsurface/phase1_evidence/ohm_tooling_revert_log.md`:
+Per `../kwin_overlay_subsurface/phase1_evidence/ohm_tooling_revert_log.md`:
 
 - `qt6-base-fourier 1:6.11.0-3` installed.
 - `kwin-fourier 1:6.6.4-3` installed.
@@ -65,19 +148,29 @@ Per `kwin_overlay_subsurface/phase1_evidence/ohm_tooling_revert_log.md`:
 - `drm-info 2.9.0-1` installed.
 
 These were not reverted at the predecessor's close-out. This
-campaign inherits them unless an explicit revert is part of
+campaign inherits them as **system state**, distinct from
-the design.
+**measurement data**. A different system state (e.g. a fresh
+Plasma session, or the same packages but different uptime)
+might produce different measurements; this is exactly why
+in-session baseline acquisition matters.
 
 ## Non-upstreaming default
 
-Inherited from the predecessor and from `ohm_gl_fix`. Bug
+Inherited from the predecessors. Bug reports + MRs are
-reports + MRs are explicit operator-tasked decisions, not
+explicit operator-tasked decisions, not background process
-background process steps.
+steps.
 
 ## File map (will grow)
 
 | File | What it is |
 |---|---|
 | `README.md` | This file. |
-| `phase0_findings.md` | Substrate from the predecessor + the candidate research question. **Awaits operator confirmation/redirect on the question itself.** |
+| `phase0_findings.md` | Locked motivation + experimental matrix + open questions before Phase 1. |
-| `worklist.md` | Phase-by-phase task list. Phase 0 only as of campaign start. |
+| `worklist.md` | Phase-by-phase task list. |
+| `phase0_evidence/` (created when first run lands) | Phase 0 inventory + A1 baseline rep. |
+
+## Repository
+
+`ssh://gitea@git.reauktion.de:2222/marfrit/x11-session-research.git`
+(public). Cloned/pushed via SSH on port 2222 per the home-infra
+gitea convention.

phase0_findings.md

@@ -1,24 +1,68 @@
-# Phase 0 — substrate and provisional research question
+# Phase 0 — substrate and locked research question
 
-This is the campaign's Phase 0 substrate doc: what we already
+This is the campaign's Phase 0 doc: the locked research
-know from the predecessor `kwin_overlay_subsurface` close-out,
+question (see § "Research question (LOCKED 2026-05-03)"
-what's open, and what the candidate research question looks
+below), the substrate inherited as *context* from the
-like. **The research question is provisional and awaits
+predecessor `kwin_overlay_subsurface`, and the open questions
-operator confirmation before Phase 1 lock.**
+this campaign answers in-session before Phase 1 binding cells
+lock.
 
-## Predecessor close-out summary
+## Campaign-contained data discipline (governing rule)
+
+**This campaign acquires all its own measurement data from
+scratch in this session.** Predecessor measurement numbers
+(drop counts, perf percentages, Δ_present medians, kwin %CPU
+values, threshold values) are documented for *context* but
+**never imported as binding cells, comparison targets, or
+success criteria**.
+
+Concretely, in this Phase 0 doc:
+
+- Numbers from `kwin_overlay_subsurface` Phase 3 / Phase 3-prime
+  (e.g. "C5' had 32 drops total / 22 post-warmup"; "median
+  Δ_present 45.85 ms"; "kwin %CPU median 36.90") are quoted
+  **only as evidence of past measurements that may or may not
+  reproduce**. They establish the SHAPE of what's measurable
+  and the fact that measurement infrastructure works on this
+  hardware. They do **not** establish "this is the baseline
+  the X11 cells will be compared against."
+- The Phase 0 A1 baseline rep (worklist.md) is the
+  in-session anchor for any with-KWin Wayland measurement
+  this campaign references.
+- No `metrics.csv` row in this campaign is populated from
+  predecessor data, even if the predecessor measured an
+  identical condition.
+- If an X11 cell appears to "match the cage Phase 0 number,"
+  that's incidental — the cage Phase 0 number is not the test
+  this campaign is running. The test is "X11 vs in-session
+  Wayland baseline."
+
+The discipline lesson is concrete: the predecessor's Phase 1
+binding cell `drops_post_warmup == 0` was anchored to a single
+ohm_gl_fix Phase 0 cage measurement (7 drops total / 0
+post-warmup). Three weeks of phase planning ran on the
+assumption that floor existed. At N=3 in-session replication
+on the closing day of the predecessor, that floor was missing
+(cage today: 22 / 26 / 56 post-warmup). The campaign closed
+without patch. **A 30-minute N=3 same-session baseline check
+on day 1 would have made the campaign different — or made it
+honestly close earlier.** This campaign acts on that lesson.
+
+## Predecessor close-out summary (context, not data)
 
 [`../kwin_overlay_subsurface/phase8_handover.md`](../kwin_overlay_subsurface/phase8_handover.md)
 (closed 2026-05-03 without patch). Three independent reasons
-no patch landed:
+no patch landed (numbers below are quoted as historical
+context per the governing rule above):
 
-1. The campaign's locked Phase 1 reference floor
+1. The predecessor's locked Phase 1 reference floor
-   (`drops_post_warmup == 0` from cage) is unreachable at N=3
+   (`drops_post_warmup == 0` from cage) was unreachable in the
-   today. Today's median is 26 post-warmup with the same
+   predecessor's closing N=3 measurement session — same
    chromium-fourier binary, same hardware, same kernel, same
-   Mesa, same kwin-fourier — KWin direct reproduces Phase 0's
+   Mesa, same kwin-fourier as the original Phase 0 measurement.
-   29 post-warmup, but cage now also drops ~22-56 post-warmup
+   KWin direct's number reproduced; cage's 0-floor did not.
-   instead of Phase 0's 0.
+   Numbers quoted in the predecessor's `phase3_prime_findings.md`;
+   not used here as a baseline for any cell.
 2. The campaign's surface-of-investigation
    (`wp_subsurface` overlay route) is not engaged by
    `brave_drops_test.html`. Chromium-fourier renders the video

worklist.md

@@ -1,5 +1,18 @@
 # Work items — x11-session-research
 
+## Governing rule (every phase)
+
+**Campaign-contained data acquisition.** Every measurement
+this campaign relies on is acquired in this campaign's
+session. Predecessor numbers are reference history, never
+imported as binding cells, comparison targets, or success
+thresholds. The A1 baseline below is not optional — it is
+the in-session Wayland anchor against which X11 cells are
+compared. See `phase0_findings.md` § "Campaign-contained data
+discipline" and `README.md` § "Campaign-contained data
+discipline" for the full rule and the predecessor lesson
+that motivated it.
+
 ## Phase 0 — substrate + research question + inventory
 
 **Status: IN PROGRESS.** Motivation LOCKED 2026-05-03 in
@@ -64,13 +77,17 @@ inventory and baseline-anchor work below.
   `XPresent` notify events or `INTEL_swap_event` GLX
   extension equivalents — what's available on rockchip is
   open.
-- [ ] **A1 baseline: Wayland-with-KWin reference rep.**
+- [ ] **A1 baseline: in-session Wayland-with-KWin anchor.**
-  1× `kwin_timing_nodebug`-equivalent run on current Plasma
+  Mandatory per the governing rule. 3 reps minimum (variance
-  Wayland session captured into
+  is a real concern on this hardware per the predecessor
-  `phase0_evidence/wayland_baseline_rep1/` as the
+  data) of a `kwin_timing_nodebug`-equivalent run on the
-  same-session anchor for the cross-session
+  current Plasma Wayland session, captured into
-  Wayland-vs-X11 comparison. Per
+  `phase0_evidence/wayland_baseline_repN/`. **This is the
-  `feedback_replicate_baseline_first.md`.
+  only Wayland baseline this campaign uses.** No
+  predecessor number substitutes for these reps even if the
+  predecessor measured an "identical" condition. The 3 reps
+  also surface the session-internal variance up front, so
+  Phase 1 thresholds aren't drawn against a single sample.
 
 ## Phase 1 — binding cells + measurement protocol
 
@@ -81,10 +98,14 @@ lock will produce `phase1_lock.md` with:
   drops_post_warmup, end-to-end-latency-if-testable,
   compositor+browser CPU at steady state).
 - The clear-pass / clear-fail thresholds: what "X11 is faster"
-  means quantitatively. Provisional: a matrix cell counts as
+  means quantitatively. Thresholds are drawn from the A1
-  "X11 faster" if effective_fps under X11 is ≥ 28 (out of 30
+  Wayland baseline acquired in *this* campaign — not from
-  source) AND drops_post_warmup is ≤ 5, on a same-session
+  predecessor numbers. Provisional shape (numbers TBD from
-  cross-paired comparison with the corresponding Wayland cell.
+  A1): a matrix cell counts as "X11 faster" if its effective
+  fps exceeds the campaign's same-cell Wayland median by a
+  margin larger than the campaign's same-cell Wayland IQR,
+  and its drops_post_warmup is materially below the same
+  cell's Wayland median.
 - The measurement protocol per matrix cell, including how the
   X11 sessions are entered and how the browser is launched
   with libva forced on/off. Mirrors the structure of
@@ -96,10 +117,10 @@ Pending.
 
 ## Discipline carry-overs from `kwin_overlay_subsurface`
 
-- *Replicate the baseline first* — per
+- *Campaign-contained data acquisition* — see governing rule
-  `feedback_replicate_baseline_first.md`. Phase 0 task "A1
+  at the top of this file. The strongest version of the
-  baseline" exists specifically because of this lesson; do not
+  predecessor's "replicate the baseline first" lesson:
-  skip it.
+  **don't import predecessor data at all**, acquire it fresh.
 - *Phase discipline* — no patches before source-read is
   documented. Re-scoping must be honest about deferral target.
 - *Non-upstreaming default* — bug reports + MRs are explicit