Retire the unreachable seismic-moment and earthquake-profile modules

[zkWizard]

What this removes

Ten src/lib modules and their ten unit tests. Every one of them has been
unreachable from the app bundle since the week it was written (Jul 13 – 27,
2026) — confirmed by node scripts/walk-wired.mjs, not by a stale list.

They form one closed subtree: seismicMoment.ts is imported by five of the
seismicMoment* modules, and nothing outside the group imports any of them
except their own .test.ts files.

Deleted modules (git history preserves them — resurrect deliberately)

module	src	test	last touched
seismicDepthProfile.ts	116	115	2026-07-13
seismicDispersion.ts	193	142	2026-07-14
seismicIntereventTime.ts	255	194	2026-07-27
seismicMagnitudeProfile.ts	137	124	2026-07-15
seismicMomentByDepth.ts	203	164	2026-07-14
seismicMomentConcentration.ts	180	120	2026-07-14
seismicMomentDepthCentroid.ts	207	150	2026-07-15
seismicMomentRate.ts	160	156	2026-07-15
magnitudeFrequency.ts	162	160	2026-07-14
earthquakeTimeline.ts	104	125	2026-07-16

Kept deliberately

• seismicMomentScaleBasis.ts — 8 days old, inside the 14-day protection
  window.
• seismicMoment.ts — still imported by seismicMomentScaleBasis.ts, so it
  is not unreachable once that module stays.

Everything else in the geology library (earthquakes.ts, earthquakeContext.ts,
magnitudeScale.ts, seismicFixedDepth.ts, seismicNetworkGeometry.ts,
volcanoElevationProfile.ts, …) is untouched.

Deletion criteria, all satisfied

• Not imported by anything but their own tests and each other (import graph
  resolved, not name-grepped).
• All older than 14 days.
• Not touched by any open PR (Explain an empty land-surface-temperature probe instead of blaming the app #1042, Say what the aerosol trend was fitted across #1043, Branding redesign (recovered Jul-28 work) — draft for visual review #959 checked).
• Not part of the environmental scientist's multi-month series arc — no
  percentile, SPI, seasonal-baseline, or record-margin module is in this set.

The two source edits

phenologyLevelProfile.ts and volcanoElevationProfile.ts each carried a
doc-comment cross-reference to seismicDepthProfile.ts. Those clauses are
dropped so no comment points at a deleted file; the quantile method they were
describing (R-7 / NumPy-default) is still named in place, and one redundant
"it parallels …" sentence goes with them. No scientific claim, citation,
threshold, or math is altered anywhere in this PR.

Line deltas

• Source only: −1,719 (+4 / −1,723)
• With tests: −3,169 (+4 / −3,173)

src/lib: 276 → 266 modules; the walk now reports 154 wired, 112
unreachable.

Gates

npx tsc --noEmit clean · npm test 289 files / 4,502 tests green ·
npx prettier --write on both touched files (unchanged) · npm run build every
chunk ok.

Visible: none — dead code removal. The two edits are inside /** */ blocks;
no rendered string, panel, or export changes.

🤖 Generated with Claude Code