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5f7fa9771f
Companion to browse/test/terminal-agent-detach-reattach.test.ts (static-grep
tripwires) — calls appendToRingBuffer + buildReplayPayload directly to prove
behavioral correctness without spinning up a real Bun.serve listener.
* 11 runtime cases: append + byte counting, oversize eviction with
one-frame floor (the eviction loop guard that prevents an oversized
single frame from emptying the buffer), alt-screen tracking via
canonical xterm CSI ?1049h / CSI ?1049l, trailing-state-wins for
enter+exit pairs inside a single render frame, soft-reset prefix
ordering, optional alt-screen re-enter, payload length math.
* Exports appendToRingBuffer, buildReplayPayload, and the PtySession
interface from terminal-agent.ts (purely for testability — they
were module-private; the change is annotation-only).
* Lease registry sanity check: mint two sessions, verify distinct
sessionIds, both valid simultaneously. Catches future refactors
that accidentally couple lease + ring buffer.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>