Retire the unreachable multi-signal brief descriptor family

[zkWizard]

Rung 2 — shrink the dead library. Twenty-one src/lib modules and their 21 test
files, removed whole.

Visible: none — dead code removal. The wired module count is unchanged at
147 and every bundle chunk is byte-comparable; src/lib goes 293 → 272
modules and 146 → 125 unreachable.

What this family was

All 21 sit downstream of environmentBrief.ts: a "provenance-first property
descriptor for a multi-signal environment brief" set built 2026-07-13 → 07-28,
plus the brief* synthesis layer above it and its entry point,
placeObservationBrief.ts. The entry point was itself never wired, so
nothing beneath it could reach the app — the whole subtree has been staged since
the week it was written.

environmentBrief.ts itself stays: five wired modules (coverageAdequacy,
briefValuePrecision, spatialSupport, briefValueUncertainty,
observationModality) import its types.

Deleted modules

Descriptor set: measurementScale, observingSystem, signalCompartment,
signalReferenceFrame, spatialExtensivity, processingLevel,
registrantProvenance, unitCommensurability, sourceIndependence,
observationRecency, observabilityGating, coObservedCoverage,
citationConsistency.

Synthesis layer: briefDigest, briefCitationBundle, briefCoObservation,
briefCurrency, briefLegendSaturation, briefRecordDepth,
briefSourceIndependence.

Entry point: placeObservationBrief.

Each .ts came with a matching .test.ts; both went. Git history preserves
every one — resurrect deliberately if a wired consumer ever wants it.

Why these and not the other 125

Three near neighbours were kept deliberately, each blocked by exactly one
edge, so this stays a pure deletion with no test or doc edits:

• citationCompleteness — imported by briefProvenanceIntegrity, which is 7
  days old and therefore protected.
• quantityKind, temporalAggregation — asserted by methods-doc.test.ts;
  removing them would mean editing a test's assertions and the doc behind it.
• signalDomain — type-imported by the wired atmosphereProbeDomain.

Not touched: the multi-year descriptor families (percentiles, SPI, seasonal
baselines, record margins, seasonal cycles/harmonics across air temperature,
precipitation, ocean, aerosol, phenology, snow, seismic). Those are the
environmental scientist's approved series-fetch arc — they are staged because
the place panel samples a two-month pair, not because they are abandoned, and
the shared multi-month series fetch is meant to wire them.

Conditions checked, all 21

Unreachable per node scripts/walk-wired.mjs (regenerated this run, not a
stale list) · last commit 21–36 days ago · absent from all four open PRs
(#1031, #1029, #1027, #959) · no reference anywhere in docs/, e2e/,
comms/, scripts/ or README.md · no surviving file in the repo imports
any of them (verified by resolving every relative import in the tree, not by
grep).

Deltas

• Source: −5,795 lines (21 files)
• Tests: −5,067 lines (21 files)
• With tests: −10,862 lines, 0 added.

Gates

npx tsc --noEmit clean · npm test 295 files / 4,534 tests passed (was
316 / 4,701 — the delta is the 21 removed test files) · npm run build every
chunk ok, zero FAIL, total JS 288.5 kB gzip · prettier not applicable, no
file was modified. Full local e2e not run: no source file changed, so no panel,
DOM or copy behaviour can differ — the required E2E smoke (WebGL) job covers
it on CI.

🤖 Generated with Claude Code