RFC ts-ct-migration: archival flag + structural routing [PR 4]#30892

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sjust-redpanda:sjust/ts-ct-migration-pr4

Commits on Jul 2, 2026

cloud_topics/stm: don't pin truncation on an idle ctp_stm

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cloud_topics/stm: pre-install an idle ctp_stm on tiered-storage partitions

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cloud_topics/stm: add explicit-log-offset advance_reconciled_offset overload

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archival: create the archival STM on cloud-topic partitions

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archival: clamp local-log trim while the manifest holds archived data

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cluster: install the eviction STM on cloud-topic partitions

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cluster: carry partition_mode in partition_properties_stm

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features: add the tiered_to_cloud_migration feature

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storage: split ntp_config storage mode into topic_mode and partition_mode

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cluster/partition: feed partition_mode from partition_properties into ntp_config

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cluster/partition: bootstrap partition_mode on leadership and creation

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Merge PR0 (partition_mode substrate) into PR2 (STM coexistence) as the PR4 base
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cluster: report cloud high watermark for a trimmed-local-log tiered partition

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tests: migrating partition is served transparently as tiered storage

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