feat(sdk): chat sessions accept concurrencyKey and trigger-time named limits

[matt-aitken]

Summary

Stacked on #4853. Chat agents already accept the task-level concurrency option, but the session trigger path had no way to scope runs per chat or tenant. Session trigger config now carries concurrencyKey and up to two trigger-time named limits, so a chat agent declaring concurrency: { perKey: 1 } can actually get one run per tenant by passing a key when the session starts:

const start = chat.createStartSessionAction("support-chat", {
  triggerConfig: { concurrencyKey: user.id },
});

Design

The two fields ride the existing session trigger config, so every run the session schedules (initial, continuation, and upgrade re-triggers) carries them through one choke point on the server. All three session starters forward them: chat.createStartSessionAction, the browser AgentChat client, and handover. Named limits are validated client-side with the same rules and error messages as tasks.trigger.

The key is never defaulted from the chat ID: a session without an explicit concurrencyKey shares the task's keyless pool, so existing chat agents keep their current concurrency accounting.

[changeset-bot]

🦋 Changeset detected

Latest commit: f9ea87f

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

This PR includes changesets to release 27 packages

Name	Type
@trigger.dev/sdk	Patch
@trigger.dev/core	Patch
@trigger.dev/python	Patch
@internal/dashboard-agent	Patch
@trigger.dev/build	Patch
trigger.dev	Patch
@trigger.dev/redis-worker	Patch
@trigger.dev/schema-to-json	Patch
@internal/clickhouse	Patch
@internal/llm-model-catalog	Patch
@internal/metrics-pipeline	Patch
@trigger.dev/rbac	Patch
@internal/redis	Patch
@internal/replication	Patch
@internal/run-engine	Patch
@internal/run-store	Patch
@internal/schedule-engine	Patch
@internal/tracing	Patch
@internal/webhook-engine	Patch
@internal/webhook-sources	Patch
@internal/cache	Patch
@trigger.dev/react-hooks	Patch
@trigger.dev/rsc	Patch
@trigger.dev/database	Patch
@trigger.dev/otlp-importer	Patch
@trigger.dev/sso	Patch
@internal/testcontainers	Patch

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