fix(keeper): surface oracle staleness in /health's top-level status

[Morenikeoa]

Problem

An external oracle outage (DexScreener + Jupiter both down) already pauses affected HYPERP markets via stalePausedMarkets (src/index.ts), correctly visible on GET /pause-status. But /health's top-level status field is computed by computeHealthStatus() (src/lib/health-status.ts) using only crank cadence and liquidation-scan liveness — timeSinceLastOracle is surfaced as a raw informational JSON field in the /health response but never feeds into the status decision, and oracleService.getStaleMarkets() is never consulted by /health at all.

Production Impact

If all external oracle sources go down simultaneously while the crank loop keeps ticking on schedule (cranking with the on-chain fallback price, capped at ON_CHAIN_FALLBACK_MAX_MS), /health reports status: "ok" / HTTP 200 indefinitely. An operator or orchestrator alerting only on /health's top-level status — the natural single endpoint to watch for uptime/paging — would miss a real, ongoing oracle outage that /pause-status already correctly tracks. The two endpoints disagree on health for the same condition.

Fix

Added an optional stalePausedMarketCount input to computeHealthStatus(), defaulting to 0 so every existing caller/test is unaffected. Wired from index.ts's existing stalePausedMarkets set size. Mirrors the existing crank/liquidation-scan staleness pattern already in this function (the GH#2025 block):

• A partial outage (some but not all tracked markets stale-paused) degrades "ok" → "degraded".
• Every tracked market being stale-paused escalates to "down".
• An already-"down" status (e.g. from stalled crank) is never de-escalated by a partial oracle outage.

Proof of Fix

New tests in tests/lib/health-status.test.ts (BUG-109: oracle staleness gates status):

• Omitted/zero stalePausedMarketCount is a no-op (confirms zero behavior change for existing callers)
• Partial outage degrades "ok" to "degraded"
• Total outage (every tracked market stale-paused) escalates to "down"
• An already-"down" status is not de-escalated
• marketsTracked === 0 still short-circuits to "ok" regardless

Test Output

 Test Files  1 passed (1)
      Tests  15 passed (15)

pnpm build — clean, zero errors.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dac9a23c-2c77-40d7-804d-a315ae18ac4b

📥 Commits

Reviewing files that changed from the base of the PR and between 8ee810d and 074d285.

📒 Files selected for processing (3)

• src/index.ts
• src/lib/health-status.ts
• tests/lib/health-status.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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