fix(keeper): override ws to 8.21.0, closing two reachable memory-exhaustion CVEs

[Morenikeoa]

Problem

pnpm audit flags two distinct ws advisories — both titled "Memory exhaustion DoS from tiny fragments and data chunks" (GHSA-96hv-2xvq-fx4p) — reachable via two separate transitive paths in the resolved dependency tree:

• rpc-websockets>ws, pulled in via @solana/web3.js for account-subscription websockets (vulnerable >=8.0.0 <8.21.0)
• jayson>isomorphic-ws>ws, pulled in via @solana/web3.js's JSON-RPC client (vulnerable >=7.0.0 <7.5.11)

Both are on the keeper's live account-watching/RPC hot path, not a dev-only dependency.

Production Impact

A malicious or compromised RPC websocket endpoint could send tiny fragmented frames to exhaust the keeper process's memory, crashing the liquidation/crank loop — availability risk on a 24/7 liquidation bot.

Fix

Added a pnpm.overrides entry in pnpm-workspace.yaml forcing ws to ^8.21.0 across the whole resolved tree:

 overrides:
   vite: 8.0.8
+  ws: ^8.21.0

pnpm why ws confirms a single deduplicated 8.21.0 (patched for both advisories) now replaces the previously-resolved 7.5.10 and 8.20.0.

Proof of Fix

• pnpm install — clean; pnpm audit no longer lists either ws advisory.
• pnpm why ws — "Found 1 version of ws" (8.21.0), used by both the rpc-websockets and jayson/isomorphic-ws paths.
• pnpm build — clean, zero errors.
• Full test suite: 974 passed, 33 skipped, 1 pre-existing unrelated failure (tests/v17-risk-params.poc.test.ts — stale assertion from fix(keeper): accept maintenanceMarginBps==10000 (valid fast-path) — found in live devnet test #345, out of scope here). No regressions from the version bump across either consuming path.

Test Output

 Test Files  1 failed | 93 passed | 2 skipped (96)
      Tests  1 failed | 974 passed | 33 skipped (1008)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 72367318-a82c-473e-8e2a-d3c88c22b878

📥 Commits

Reviewing files that changed from the base of the PR and between 8ee810d and 8fea82b.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• pnpm-workspace.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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