[merefield]

Typing / previously waited for several app-server catalogue queries, and returning to a submenu fetched it again. This adds a shared, memory-only catalogue tree so connected sessions can be discovered in the background and previously fetched menus open immediately.

Faster browsing

• Warm root catalogues from normal session discovery, using two background workers. Retain the submenus already fetched during root discovery; load deeper branches on demand and retain them by session and path.
• Use synchronous cache hits for terminal suggestions and nested menus, preserving filtering, draft restoration, selection and composer focus. Local display commands remain usable during initial discovery.
• Reuse the same Go cache for browser menu requests. Explicit terminal and browser Refresh controls bypass it.
• Bound retention to 128 menus, 256 KiB per retained menu and a two-minute lifetime. Deduplicate simultaneous reads with the existing x/sync/singleflight dependency and let each caller cancel independently.

Freshness and actions

• Scope entries to their session and daemon connection. Invalidate observed name, directory and model-setting changes; invalidate state-dependent submenus on turn-state changes while preserving stable root suggestions. Repeated notifications containing unchanged settings preserve the cache.
• Reject invalidated or expired in-flight results. Bound background retries and concurrent reads; do not retain oversized menus or branches containing typed rename/directory arguments.
• Cache display metadata only. Web preparation reads fresh options, command execution continues to re-read and validate the exact revision on the server, and attempted changes invalidate the affected catalogue. Cached menus never supply executable RPC parameters.
• No disk persistence or new configuration. README documents lifetime, refresh and restart behaviour.

Validation

• Full Go core suite with race detection; all 17 language screen regressions; go vet and formatting checks.
• Tests cover startup warming, retention of discovered submenus, deep navigation without extra reads, session isolation, copy isolation, expiry, refresh, reconnect/settings invalidation, stale in-flight results, cancellation and memory bounds.
• Real app-server fixtures verify that cached options cannot authorize a write after the session starts working.
• Eight browser regressions cover slash discovery, draft retention, nested navigation, fresh refresh requests and separate write confirmation.
• Native Windows command-menu, suggestion, cache-navigation and statusline regressions pass.
• Frontend type/format checks and production build; regenerated embedded assets and rebuilt local binaries.

[Copilot]

🟡 Changes recommended

Cache invalidation and empty-menu serialization introduce browsing failures and stale submenu reuse.

3 open issues

• Preserve empty choices as [] instead of null · New
• Use per-session generations for session read validation · New
• Invalidate cached submenus across complete turn-state cycles · New

What changed in this PR

Adds a shared, in-memory command catalogue cache to make terminal and browser slash-command browsing faster.

Changes:

• Warms root catalogues and retains submenus with bounded storage and expiry.
• Adds immediate terminal cache hits and explicit refresh bypasses.
• Preserves fresh action validation and adds cache, navigation, and refresh regressions.

File	Description
web/​tests/​browser.spec.ts	Checks explicit refresh requests.
web/​src/​SessionCommands.svelte	Sends cache-bypassing refresh requests.
README.md	Documents cache lifetime and refresh behavior.
internal/​web/​dist/​index.html	References the rebuilt bundle.
internal/​web/​dist/​assets/​index-D1LQiLkx.js	Includes browser refresh changes.
internal/​web/​control_commands.go	Uses fresh reads for refresh and preparation.
internal/​web/​control_commands_test.go	Tests fresh-read routing.
internal/​ui/​monitor_suggestions.go	Opens cached suggestions immediately.
internal/​ui/​monitor_commands.go	Adds cached navigation and forced refresh.
internal/​ui/​monitor_commands_inline.go	Bypasses cache on inline refresh.
internal/​ui/​monitor_command_cache_test.go	Tests cached navigation and local commands.
internal/​codex/​session_commands.go	Exposes shared cache access.
internal/​codex/​session_commands_unix.go	Scopes menus and collects discovered submenus.
internal/​codex/​session_commands_unix_test.go	Tests submenu retention and write validation.
internal/​codex/​session_command_cache.go	Implements bounded caching and background warming.
internal/​codex/​session_command_cache_test.go	Tests cache lifecycle and isolation.
internal/​codex/​live_usage.go	Holds the shared cache.
internal/​codex/​daemon_status_unix.go	Tracks connection generations.
internal/​codex/​client.go	Starts warming from telemetry discovery.
go.mod	Makes singleflight dependency direct.

_{Review effort: Balanced}