[arzafran]

The changelog and user docs now cover what shipped since Oct 28, so the docs match the app again.

• CHANGELOG Unreleased gains entries for the storage popover, cache cleaning, the low-disk warning, worktree auto-cleanup, pane headers, tab drag-out, sidebar rows, the usage fix and more.
• workspace-interface.md documents pane headers, moving a tab to a new window, sidebar rows and provider usage.
• socket-api.md now lists all 162 contract methods, including agent.task.*.
• Stale counts, a wrong line-cap claim in CLAUDE.md and history-style wording are removed.

Not done: the README hero screenshot needs a fresh capture. The documented UI was read from source, not seen running.

Fixes INC-492