feat: multi-signal checkpoint linkage for resilience across git rewrites#840

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peyton-alt wants to merge 12 commits intomainfrom

peyton/ent-834-tree-hash-checkpoint-linkage

Commits on Apr 7, 2026

fix: allow checkpoint trailers on agent-initiated sequence operations

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feat: store tree hash in checkpoint metadata

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fix: add debug logging + remove unrelated files

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feat: add LinkageMetadata struct to CheckpointSummary

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test: add GitRevParse, GitCheckout, GitRebase testutil helpers

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feat: add ComputePatchID and ComputeFilesChangedHash to gitops

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feat: wire multi-signal linkage through condensation pipeline

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test: add linkage round-trip tests for WriteCommitted/ReadCommitted

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fix: restore nolint:ireturn comments and add encoding/hex import

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fix: restore nolint:ireturn comments and add git user config for CI

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fix: address review feedback for multi-signal linkage

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style: simplify ComputePatchID output parsing and fix minor issues

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