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Jinwoo-H
2c479aabd7
Both hosts already bounded live browser renderers, but with two separate implementations: the desktop app evicted hidden worktrees' webview guests on a visibility change, and the headless page reclaimer re-evaluated residency every 15 seconds. The rule they were each expressing turned out to be the same one — keep the most recently used, never evict something in use, optionally shed what has gone stale — so it now lives in src/shared/browser-retention-budget.ts and each host supplies its own configuration and its own trigger. The desktop keeps its exact behaviour: rank-only, no clock (idleMs Infinity, graceMs 0), the active worktree left out of the budget entirely, and isEvictable still consulted lazily. Its 13 tests pass unchanged. Headless drops the recurring sweep. A repeating heartbeat was never needed: the limit can only be crossed when a page is created, woken or closed, and every one of those already re-arms. Only the idle window needs a clock, so the reclaimer now computes the earliest moment its own answer could change and arms one timer for it. A host with nothing resident holds no timer at all, and one pinned by a download or a streamed client re-asks on a bounded cadence because releasing those pins raises no event the backend can observe. Two guards fell out of building it. The deadline and the selector are separate functions, so a fuzz test asserts nothing can become evictable before its deadline — it catches an off-by-one in the rank branch. And a sweep that frees nothing now backs off, measured by observed residency rather than by trusting park(), which no-ops for a window that is already gone; without it a deadline that lands early re-arms at 0ms and spins. Headless semantics change in one case: a stale pinned page no longer forces fresher unpinned pages to be evicted in its place. That is the desktop rule, and the limit was already documented as exceedable by pinned work. Removes ORCA_HEADLESS_BROWSER_PARK_SWEEP_MS, which no longer has a meaning.