Make compaction threshold an optional runtime override

[govindavashishtha]

Summary

• Add a custom compaction threshold toggle in runtime config (off by default; no trigger so the runtime derives ~80% of the model context window).
• Turning the toggle on writes trigger: { type: 'input_tokens', value: 50000 } and shows an editable number input to the left of the switch; turning it off drops trigger entirely.
• Clarify Context compaction copy and cover toggle on/off in UI tests.

Test plan

• Open Runtime Config → Context compaction: custom threshold switch is off and no number input is shown
• Toggle custom threshold on: input appears with 50000; config includes trigger
• Change the input value and confirm it persists in the draft config
• Toggle custom threshold off: input disappears and trigger is removed from config
• With Context compaction off, custom threshold row is disabled/dimmed
• pnpm --filter @truefoundry/trueforge-ui exec vitest run test/atoms/draft/AgentConfigEditors.test.tsx

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🦋 Changeset detected

Latest commit: 3c09e99

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@truefoundry/trueforge-ui	Patch

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