Archive mge-lane-death as complete — superseded

[Jammy2211]

The MGE multi-start lane investigation (active.md :: mge-lane-death,
autolens_profiling#128) is done in substance: the cause was found on 2026-08-15
and every follow-up it owed has since shipped. The remaining confirmation legs
(GPU / float64 / multi-seed re-measurement of the 62%) are superseded and not
carried forward as scoped.

Unlike the two shelvings that preceded it (#204, #205), this one earns a dated
completion record rather than complete/archive/shelved/ — the work produced a
cause, a refuted hypothesis, a counter-finding and six merged PRs, and five
existing records already cite the investigation.

Changes

• lifecycle.py record mge-lane-death --date 2026-08-18 — writes
  complete/2026/08/mge-lane-death.md, folds in active/mge_lane_death.md, and
  drops the active.md section
• repoint the inference-programme-ledger disjointness note at the record; its
  research/mge-lane-death branch was never created
• regenerate complete/index.md and dashboard.md (in flight 8 → 7)

What the record preserves

• Cause — the deaths are in the PRIOR term, not the likelihood. Lanes walk
  out of UniformPrior support and resurrect=False never redraws them; that
  accumulation is the 62%. The likelihood never went non-finite in ~7200
  lane-steps across three arms.
• Refuted hypothesis — widening the shear box made it marginally worse.
• Counter-finding — the ell_comps plateau was masked, not cleared; the
  constrained count is 667 (27.79%) once the prior deaths are removed, from a
  diagnostic arm and so not a citable production number.
• Trap — 62% is a survival integral, not a hazard rate. Grade any re-run on
  the alive-versus-step curve.
• Shipped downstream — PyAutoFit#1477/#1478/#1479/#1480/#1482 and
  autolens_profiling#132, plus the upstream counter (PyAutoFit#1475,
  PyAutoGalaxy#572).
• Not carried forward — the GPU/float64/multi-seed confirmation, the
  unmasked ell_comps trapping draft, and the undrafted clipper phase 3.

Checks

• lifecycle.py check: OK
• lifecycle.py index --check: OK

Follow-up owed

Tracking issue autolens_profiling#128 is still open and wants closing by hand —
that repo is out of this session's scope.

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