CI note from the autonomous code-fix launcher: the focused change in this PR is limited to sdks/typescript/pmxt/escrow.ts plus a regression in sdks/typescript/tests/hosted-dispatch.test.ts for #1050.

The red generated-sync checks are not caused by this focused escrow change. I inspected the failed logs:

• Verify client.py methods are up-to-date / Verify client.ts methods are up-to-date want node sdks/*/scripts/generate-client-methods.js and would remove or rewrite broad hosted-mode dispatch/client sections unrelated to this issue.
• Verify API_REFERENCE.md files are up-to-date wants broad docs/type reference churn for positions/balances/matching fields unrelated to escrow withdraw payload parity.

Per the PMXT generated-drift policy, I am keeping this PR scoped rather than folding unrelated generated drift into it. Static regression assertions over the touched files passed locally; Jest/tsc startup hung in this cron checkout with no output until timeout, while GitHub's TypeScript analysis passed.

PR Review: PASS (NOT VERIFIED)

What This Does

Aligns TypeScript hosted escrow withdrawTx() request bodies with the Python SDK by adding token: "usdc" and the resolved user_address, and by omitting amount for non-amount actions. This matters because hosted escrow withdrawal requests need the wallet and token context to build the correct transaction.

Blast Radius

TypeScript SDK hosted escrow write path plus hosted-dispatch tests. No core sidecar/OpenAPI changes and no Python SDK changes.

Consumer Verification

Before (base branch):
The TypeScript SDK built the hosted request body as:

body: { action, amount: normalizedAmount }

For withdrawTx("claim"), normalizedAmount was null, and no wallet/token was sent.

After (PR branch):
The SDK resolves the wallet before dispatch and sends:

body: {
 action,
 token: "usdc",
 ...(normalizedAmount === undefined ? {} : { amount: normalizedAmount }),
 user_address: address,
}

For claim/cancel actions, amount is omitted rather than sent as null.

Test Results

• Build: NOT VERIFIED; TypeScript SDK build failed before this PR-specific code on missing generated SDK artifacts: Cannot find module '../generated/src/index.js'.
• Unit tests: NOT VERIFIED; tests/hosted-dispatch.test.ts failed to collect for the same missing generated artifact.
• Server starts: N/A
• E2E smoke: NOT RUN (hosted write request not sent)

Findings

No blocking findings.

PMXT Pipeline Check

• Field propagation (3-layer): N/A
• OpenAPI sync: N/A
• Financial precision: OK — bigint amount path still stringifies before request body inclusion.
• Type safety: OK from source review; full tsc blocked by missing generated artifacts.
• Auth safety: OK — wallet address is required via existing resolveWalletAddress; no credentials logged.

Semver Impact

patch -- fixes request body parity for an existing SDK method.

Risk

I could not run the hosted-dispatch Jest test or TypeScript build in this cron image because sdks/typescript/generated/src/index.js is absent and SDK generation requires Java (java: not found). Verification is therefore source-level, not executable package-level.