Python Router `fetch_market_matches` routes to deprecated `"fetchMatches"` sidecar method instead of canonical `"fetchMarketMatches"`

[realfishsam]

Gap

The Python SDK Router.fetch_market_matches() calls the sidecar using the deprecated method name "fetchMatches". The TypeScript SDK Router.fetchMarketMatches() correctly uses the canonical name "fetchMarketMatches". This inconsistency means the Python SDK is one sidecar deprecation-removal away from silently breaking.

Current state

Python SDK (sdks/python/pmxt/router.py:201):

raw = self._call_method("fetchMatches", params)  # deprecated name

TypeScript SDK (sdks/typescript/pmxt/router.ts): uses "fetchMarketMatches" (canonical).

Core (core/src/router/Router.ts): fetchMarketMatches is the canonical method name; fetchMatches is the deprecated alias.

Note: issue #858 tracks the Python Router missing min_difference and sort parameters on this method, but does not cover the method name discrepancy.

Expected behaviour

sdks/python/pmxt/router.py line 201 should call self._call_method("fetchMarketMatches", params) to match the canonical sidecar method name used by the TypeScript SDK.

Impact

If the sidecar ever removes the fetchMatches deprecated alias, Python Router.fetch_market_matches() will break silently (404 or method-not-found). The TypeScript SDK will continue to work.

[realfishsam]

Closing as duplicate of #656. Same underlying finding: Python Router.fetch_market_matches calls the sidecar using the deprecated endpoint name "fetchMatches" instead of the canonical "fetchMarketMatches". No additional context beyond what is already in #656.

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