fix: align SDK parity gaps

[realfishsam]

Summary

• forward Limitless wallet addresses through Python SDK credentials for delegated signing
• align Python order validation failures with the SDK ValidationError hierarchy
• add missing trade outcome ID fields to both SDK models
• call the current router fetchMarketMatches endpoint and align Python Router auto-start defaults
• widen TypeScript ExchangeOptions.signatureType to accept string values
• keep Python stop_server/restart_server as non-deprecated first-class aliases

Fixes #935
Fixes #930
Fixes #745
Fixes #656
Fixes #701
Fixes #929
Fixes #702

Test Plan

• python3 -m compileall sdks/python/pmxt
• npm run generate:docs --workspace=pmxt-core (no substantive generated doc diffs)
• npm run build --workspace=pmxtjs (blocked: generated SDK missing, and regenerating requires java which is not installed in this environment)
• npm run build --workspace=pmxt-core (attempted; timed out in this environment)

[realfishsam]

PR Review: PASS (NOT VERIFIED)

What This Does

Aligns SDK parity gaps: Python server aliases, wallet-address credential plumbing, ValidationError usage, order/trade fields, and TypeScript signature type/outcome fields.

Blast Radius

Python SDK exports/client/router/models and TypeScript client/models; no core server schema changes.

Consumer Verification

Before (base branch):
Base SDKs had parity mismatches such as deprecated warnings for flat server aliases, missing walletAddress credential forwarding, and fetchMatches call naming drift.

After (PR branch):
PR updates those SDK surfaces. Core build/Jest passed (24 suites, 644 tests); root verification then failed in the Python SDK phase because pytest is not installed.

Test Results

• Build: PASS
• Unit tests: CORE PASS (24 suites, 644 tests; root verification blocked by missing pytest)
• Server starts: PASS during root verification
• E2E smoke: NOT VERIFIED (SDK import/call smoke not run)

Findings

No blocking findings.

PMXT Pipeline Check

• Field propagation (3-layer): N/A
• OpenAPI sync: N/A
• Financial precision: N/A
• Type safety: OK
• Auth safety: OK — credential field is forwarded, not logged

Semver Impact

patch -- SDK parity/typing fix.

Risk

SDK consumer behavior was not executed end-to-end because the local Python SDK test dependency is missing.