Remove dead `captureBase`

[quintessence-proof]

File: src/utils/capture.ts

Action

Delete the entire export const captureBase = async (...) => { ... } block. It has no live callers.

Verify first

grep -rn "captureBase" src/
# Expect: only the definition + one comment reference. No call sites.

After deleting

Confirm the live path is intact:

• capture() → buildEventProperties() → sendToTelemetryProxy()

No other edits required. The duplicated property-building logic that lived in captureBase is already present in buildEventProperties, so nothing is lost.