chore(deps): upgrade Mastra client to 1.38

[betegon]

Summary

• upgrade @mastra/client-js to 1.38
• align the CLI's bundled Mastra Core with 1.57 for the upcoming native agent suspend/resume work
• include the 1.38 streamed UTF-8 decoding fix

The manifest still declared ^1.26.0, but the lockfile already resolved 1.36.0. The effective runtime change in this PR is therefore client 1.36.0 → 1.38.0 and Core 1.55.0 → 1.57.0.

CLI size

Measured from clean origin/main and this branch with the same SENTRY_CLIENT_ID and build commands:

Artifact	Before	After	Delta
npm CJS bundle	4,436,770 B	4,421,081 B	-15,689 B (-0.354%)
npm ESM bundle	4,430,445 B	4,414,748 B	-15,697 B (-0.354%)
npm package, packed	4,427,924 B	4,426,976 B	-948 B (-0.021%)
npm package, unpacked	15,432,004 B	15,400,618 B	-31,386 B (-0.203%)
standalone JS payload	4,378,769 B	4,363,073 B	-15,696 B (-0.358%)
macOS arm64 binary	107,027,744 B	107,011,328 B	-16,416 B (-0.015%)
macOS arm64 gzip	27,971,571 B	27,971,237 B	-334 B (-0.001%)

No size regression: every measured artifact is slightly smaller.

Validation

• pnpm install --frozen-lockfile
• pnpm --filter sentry run typecheck
• pnpm --filter sentry run lint
• pnpm --filter sentry run check:deps
• SENTRY_CLIENT_ID=ci-fork-pr-dummy pnpm --filter sentry run bundle
• SENTRY_CLIENT_ID=ci-fork-pr-dummy RELEASE_BUILD=1 pnpm --filter sentry run build
• Mastra init transport tests: 68 passed
• npm bundle smoke on Node 20.20.2: --help and auth status
• full unit suite: 9,109 passed; two Bash-completion tests fail identically on clean origin/main

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Project	Deployment	Actions	Updated (UTC)
cli	Ready	Preview	Aug 11, 2026 4:03pm