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## Summary - recover already-full Buzz installs before desktop initialization without deleting healthy caches - enforce a global 2 MiB UTF-16 byte budget across disposable message, channel, timeline-skeleton, and sidebar-skeleton caches, regardless of relay count - route all disposable cache writes through quota recovery and reserve roughly 3 MiB of WebKit's observed ~5 MiB quota for durable state - preserve communities, identities, preferences, drafts, and read state; match only delimiter-qualified disposable namespaces ## Context WebKit enforces an approximately 5 MiB per-origin localStorage quota and Tauri does not expose an app-level knob to raise it to 50 MiB. Buzz 0.4.26 shipped reactive recovery for selected durable writes, but disposable writers swallowed quota failures and their existing limits were count-based per relay rather than byte-based per origin. This PR handles both halves: upgrade recovery for already-wedged origins and proactive global headroom so disposable snapshots cannot drive the origin back to the cliff. ## Safety - startup first probes a one-byte marker; healthy installs retain their caches - only if the marker write fails are the four relay-rehydratable cache namespaces removed - namespace matching requires the `v1:` delimiter, preventing future `v10` or similarly named durable keys from matching - oversized individual snapshots are rejected; crossing the global budget evicts disposable snapshots only - failed recovery leaves the marker absent, so the next launch retries ## Verification - `pnpm test` — 3,670 passed - `pnpm check` - `pnpm typecheck` - push hooks: branch-skew, desktop-check, desktop-test passed - byte-budget tests cover UTF-16 accounting, multiple relays, oversized writes, durable-state preservation, healthy startup, full startup, marker retry, and namespace near misses --------- Signed-off-by: Wes <wesbillman@users.noreply.github.com> Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>