Update sdk-core to main (ff30d403)

changelog/added/heterodactylous-kaylie.md

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+Core: A local activity's `ActivityTask.Start` has `workflow_task` (field 21), with the started event id, attempt and start time of the workflow task in which Core dispatched it. `workflow_task` also has `previous_started_event_id`, `previous_attempt` and `previous_started_time`, which name the run's last completed workflow task, and `failed_tasks`, the started event ids of the run's last 100 failed or timed out workflow tasks. Retries that Core runs locally keep the value. Core leaves it unset for other activities.
+Core: Client environment config profiles include the raw TOML tables under `profile.<name>.ext`, keyed by extension name, for SDK envconfig extensions. Strict mode accepts any content under `ext`. The C bridge's profile JSON includes them as an `ext` object, with TOML datetimes as strings.

changelog/breaking-changes/heterodactylous-kaylie.md

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+Core: Core now rejects activation responses with a nondeterminism error if the activation contained only updates and the response rejects every update but also includes another workflow command. SDKs must return only update rejections when all validators reject an update-only activation.

changelog/fixed/heterodactylous-kaylie.md

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+Core: A workflow task failure reported with the cause `WORKFLOW_TASK_FAILED_CAUSE_EXTERNAL_STORAGE_FAILURE` is now counted on `workflow_task_execution_failed` with `failure_reason="ExternalStorageError"`, matching activity failures with the storage cause. It was previously counted as `WorkflowError`.
+Core: Ephemeral dev and test servers now complete the automatic port reservation handshake on Linux and macOS before starting, preventing intermittent address-in-use errors during TCP teardown.
+Core: Resource-based worker tuners now read CPU usage and quotas from standard cgroup v1 mounts. Workers on cgroup v1 systems no longer fall back to host CPU usage and admit work based on understated container load.
+Core: Preserve queued queries across workflow eviction so requests for the same run are answered instead of silently dropped.
+Core: Rejection-only update tasks no longer dispatch local activities resumed from replay before validation, allowing those tasks to remain unrecorded in workflow history.
+Core: Preparing a legacy query now remains in replay mode, preventing unrecorded local activity attempts that could execute twice or leave the workflow stuck.