fix(opencode): remove automatic full session diffs#30127
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Summary
session.diff({ messageID })and leave explicit revert diff behavior intactRoot Cause
A snapshot-heavy historical session recomputed a full session diff on each turn, despite the user not needing a full-session diff surface. In the reproduced session this traversed hundreds of historical snapshot-bearing parts and produced a multi-megabyte diff. The same session also contained an old unfinished assistant row that caused all later messages to show as queued.
Verification
bun typecheckfrompackages/opencodebun test test/session/snapshot-tool-race.test.ts test/session/processor-effect.test.ts test/session/revert-compact.test.ts test/server/session-diff-missing-patch.test.ts test/share/share-next.test.ts test/session/llm.test.ts test/provider/header-timeout.test.ts --timeout 30000frompackages/opencodebun test test/session/prompt.test.ts test/session/compaction.test.ts --timeout 30000frompackages/opencode