Phase 0: campaign skeleton, research question pending

Spun off 2026-05-03 from the closed-without-patch
kwin_overlay_subsurface campaign (its phase8_handover.md is
the predecessor). The candidate research question is whether
running an X11 session on PineTab2 reproduces, eliminates, or
transforms the drop-inversion phenomenon that motivated the
predecessor — but the framing is provisional and awaits
operator confirmation before Phase 1 lock.

phase0_findings.md is the substrate doc:
- Predecessor close-out summary (three reasons no patch
  landed; replicate-baseline-first lesson).
- What stays valid from the predecessor (Phase 1 scanout
  archaeology, Phase 2-prime KWin Wayland source-read which
  does NOT transfer to X11, Δ_present-46ms reproducible
  side-finding which is directly testable under X11,
  measurement infrastructure with WAYLAND_DEBUG-specific
  parts that don't transfer).
- Current ohm state (carry-over predecessor tooling, governor
  pin, baloo disabled, kwin-fourier still installed).
- Provisional research question with three plausible
  outcomes (α/β/γ) and four alternate framings the operator
  may have in mind that this question doesn't cover.
- Working-assumption out-of-scope list (no patches, no MRs,
  no Δ_present chase yet).
- Four pre-question Phase 0 deliverables that are unblocked
  regardless of framing: ohm state snapshot, X11-path
  inventory, X11 measurement-tool inventory, A1
  Wayland-baseline rep on this campaign's session for future
  comparison anchor.

worklist.md tracks Phase 0 only. Phase 1 lock awaits the
research question. Discipline carry-overs from
kwin_overlay_subsurface listed (replicate baseline first;
phase discipline; non-upstreaming default; memory
persistence at close).

README.md status banner: Phase 0 in progress, research
question pending operator confirmation.

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

worklist.md

@@ -0,0 +1,55 @@
+# Work items — x11-session-research
+
+## Phase 0 — substrate + research question framing
+
+**Status: IN PROGRESS.** Substrate doc landed
+(`phase0_findings.md`). Research question is provisional,
+awaits operator confirmation. Pre-question Phase 0 deliverables
+listed below are unblocked.
+
+- [x] Predecessor close-out summarised. Substrate doc
+  (`phase0_findings.md`) lists what stays valid from
+  `kwin_overlay_subsurface`, what's specific to Wayland and
+  doesn't transfer, and three plausible outcome shapes (α/β/γ)
+  for the candidate research question.
+- [ ] **Operator confirms the research question.** Three
+  candidate framings + four alternates are listed in
+  `phase0_findings.md` § "Research question (provisional)".
+  Pick one (or correct the framing) before Phase 1.
+- [ ] State snapshot of ohm under current Plasma Wayland —
+  the campaign-start *before* photo. Unattended-tractable.
+- [ ] Inventory of available X11 paths on ohm: installed
+  packages, SDDM-advertised sessions, alternate WMs,
+  XWayland availability. Read-only.
+- [ ] Inventory of measurement instruments that work under
+  X11. `xtrace`, frame-timing tooling, perf on Xorg PID, etc.
+  Read-only.
+- [ ] A1 baseline: 1× `kwin_timing_nodebug`-equivalent run
+  on current Plasma Wayland session, captured into
+  `phase0_evidence/wayland_baseline_rep1/`. Same-session
+  anchor for any future X11 comparison.
+
+## Phase 1 — locked research question + binding cells
+
+**Pending operator confirmation of the Phase 0 question.**
+Phase 1 lock will produce `phase1_lock.md` with binding cells
+specific to whichever framing is locked.
+
+## Phase 2-onwards
+
+Pending.
+
+## Discipline carry-overs from `kwin_overlay_subsurface`
+
+- *Replicate the baseline first* — per
+  `feedback_replicate_baseline_first.md`. Phase 0 task "A1
+  baseline" exists specifically because of this lesson; do not
+  skip it.
+- *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
+  operator-tasked decisions.
+- *Memory persistence rule* — when this campaign reaches its
+  diagnostic terminal state (success or honest closure), update
+  `project_campaign_overview.md` and add any new feedback
+  memory worth carrying forward to the next campaign.