fix: bound durable Inngest stream memory usage

[mastra-platform]

Summary

• close Inngest realtime subscriptions through the SDK lifecycle handle so WebSockets and fanout buffers are released
• keep internal workflow.events.v2.* watch events live while excluding them from durable replay caches
• preserve the durable step-start chunk shape while replacing full model request payloads with an empty request object
• add regression coverage and patch changesets for @mastra/inngest and @mastra/core

Fixes #20668.

Test plan

• pnpm --filter @mastra/inngest exec vitest run src/realtime-subscription.test.ts src/__tests__/create-inngest-agent.test.ts --reporter=dot --bail 1
• pnpm --filter @mastra/core exec vitest run src/agent/durable/step-start-chunk-shape.test.ts --reporter=dot --bail 1
• pnpm --filter @mastra/inngest lint
• pnpm --filter @mastra/inngest build
• pnpm build:core
• pnpm --filter ./packages/core check
• git diff --check

[vercel]

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Project	Deployment	Actions	Updated (UTC)
mastra-docs-1.x	Ready	Preview	Aug 15, 2026 5:24am
mastra-playground-ui	Ready	Preview	Aug 15, 2026 5:24am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
mastra-studio-preview	Ignored		Aug 15, 2026 5:24am

[changeset-bot]

🦋 Changeset detected

Latest commit: 84e1040

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 26 packages

Name	Type
@mastra/core	Patch
@mastra/inngest	Patch
@mastra/code-sdk	Patch
mastracode	Patch
@mastra/factory	Patch
@mastra/mcp-docs-server	Patch
@internal/playground	Patch
@mastra/client-js	Patch
@mastra/opencode	Patch
@mastra/longmemeval	Patch
mastra	Patch
@mastra/deployer-cloud	Patch
@mastra/react	Patch
@mastra/playground-ui	Patch
@mastra/server	Patch
@mastra/deployer	Patch
create-mastra	Patch
create-factory	Patch
@mastra/express	Patch
@mastra/fastify	Patch
@mastra/hono	Patch
@mastra/koa	Patch
@mastra/nestjs	Patch
@mastra/next	Patch
@mastra/tanstack-start	Patch
@mastra/temporal	Patch

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[dane-ai-mastra]

PR triage

Linked issue check skipped for excluded profile @mastra-platform[bot].

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PR complexity score

Factor	Value	Score impact
Files changed	9	+18
Lines changed	210	+12
Author merged PRs	54	-20
Test files changed	Yes	-10
Final score		0

Applied label: complexity: low

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Changed test gate

Changed Test Gate is pending. The Changed Test Gate / changed-tests check will update the test label when it completes.