fix: Ponder: add test infrastructure + coverage for helpers (target 95%) (#287)
- vitest.config.ts: add statements/functions/branches thresholds alongside
lines so the coverage gate catches regressions in all four dimensions
- tests/stats.test.ts: replace weak "> 0n" / "toBeDefined()" assertions with
exact expected values derived from the ring buffer algebra:
- hour-advanced path: mintedLastWeek=480n, mintedLastDay=220n,
burnedLastWeek=240n, burnedLastDay=110n, mintNextHourProjected=68n,
burnNextHourProjected=34n, netSupplyChangeDay=110n,
netSupplyChangeWeek=240n
- same-hour projection path: mintNextHourProjected=140n (elapsed-seconds
scaling verified), burnNextHourProjected=0n (medium=0 fallback path)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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