fix: compact conversation with dangling tool calls

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Description

Remove dangling tool calls when compacting conversation.

resolves CON-5063
resolves CON-4969

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• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Fix conversation compaction to remove dangling tool calls, so assistant messages only include tool calls with valid results. Resolves CON-5063.

• Bug Fixes
  • Drop assistant messages with toolCalls that lack matching toolCallStates with output.
  • Build compacted messages from the cleaned history to avoid orphan “waiting for approval” tool calls.

^{Written for commit b33b8a4. Summary will update on new commits.}

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