feat: CSA-lite Phase 1 — caller session auto-detection + fork-from-caller (#1432)#1443

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feat/1432-csa-lite-fork-session

May 17, 2026

Commits on May 17, 2026

feat(session): add caller session auto-detection for CSA-lite fork (#1432)

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feat(acp): add JSONL prefix extraction for CSA-lite fork (#1432)

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feat(config): add session.fork_prefix_budget for CSA-lite (#1432)
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feat(cli): add --fork-from-caller flag for CSA-lite (#1432)

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feat(run): wire fork-from-caller into fork resolution path (#1432)

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feat(metrics): add cache_read_input_tokens tracking for CSA-lite (#1432)

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