fix: surface websocket and feed hygiene issues

[realfishsam]

Summary

• Log previously swallowed websocket close/parse/connect errors across Gemini Titan, Kalshi, Opinion, and Polymarket US
• Avoid per-message array/object allocations in Opinion and Binance/Chainlink feed paths
• Make Gemini Titan orderbook level matching exact instead of tolerance-based

Validation

• git diff --check

Fixes #811
Fixes #719
Fixes #275
Fixes #678
Fixes #679
Fixes #727
Fixes #809
Fixes #810
Fixes #812
Fixes #686
Fixes #687

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Project	Status	Preview	Updated (UTC)
PMXT	🟢 Ready	View Preview	Jun 5, 2026, 2:22 PM

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[realfishsam]

PR Review: FAIL

What This Does

Surfaces websocket/feed hygiene failures more explicitly instead of silently masking unsupported or malformed feed/websocket states.

Blast Radius

Several exchange websocket adapters plus Binance/Chainlink feed code and SDK API references.
Changed files reviewed: core/api-doc-config.generated.json, core/src/exchanges/gemini-titan/websocket.ts, core/src/exchanges/kalshi/websocket.ts, core/src/exchanges/opinion/websocket.ts, core/src/exchanges/polymarket_us/websocket.ts, core/src/feeds/binance/binance-feed.ts, core/src/feeds/chainlink/chainlink-feed.ts, sdks/python/API_REFERENCE.md, sdks/typescript/API_REFERENCE.md

Consumer Verification

Before (base branch):
Base branch (origin/main) does not include these changes. I reviewed the diff against the base and did not run full live-exchange before/after reproduction in this daily batch.

After (PR branch):
PR branch build PASS; authenticated local sidecar smoke PASS using POST /api/mock/fetchMarkets with x-pmxt-access-token, response snippet: {"success":true,"data":[{"marketId":"mock-m0","eventId":"mock-event-0","title":"Which party wins the 2026 harborland election?","description":"incididunt magna metus ut cupidatat aliquip dolore quis incididunt id do aenean aenean non dolor dolore tempor pharetra lorem fugiat aenean est voluptate ...

Test Results

• Build: PASS (npm run build --workspace=pmxt-core)
• Unit tests: PASS (npm test --workspace=pmxt-core -- --runInBand)
• Server starts: PASS
• E2E smoke: PASS (POST /api/mock/fetchMarkets; live venue-specific calls were not made)
• Dependency install: skipped (existing workspace deps reused)

Findings

1. Generated/API-doc artifacts changed without an obvious source/generator change; verify these are regenerated outputs, not hand edits. Files: core/api-doc-config.generated.json

PMXT Pipeline Check

• Field propagation (3-layer): N/A
• OpenAPI sync: N/A
• Financial precision: OK
• Type safety: OK
• Auth safety: N/A

Semver Impact

patch -- bug fix/internal compatibility change unless SDK consumers rely on newly added APIs

Risk

The branch was built, core-tested, and authenticated-smoke-tested through the sidecar. Full live-exchange before/after behavior remains unverified for this daily batch; credentialed venue calls and venue API drift should be treated as residual risk unless covered by tests in this PR.