Widen the sessions.workspace_panes JSONB from a bare WorkspacePane[] to a
WorkspaceState envelope { panes, tabNumbers, nextTabNumber, closedPaneStack }.
The PATCH validator accepts either the legacy array or the envelope (zod union)
and normalizes to a full envelope before storing, so existing array-shaped rows
migrate transparently on next write. The session_workspace_updated WS frame
schema is widened to match (kept byte-identical to the web copy; parity test
passes).
Adds read_tab_by_number, a read-only tool that resolves a session-scoped tab
number to its chat via the persisted tabNumbers map and returns that chat's
transcript (oldest-first, sentinels skipped, capped at 20k chars). Tools gain an
optional ToolExecCtx ({ sql, sessionId }) 4th param on ToolDef.execute, threaded
through executeToolCall from executeToolPhase; the param is optional so existing
filesystem tools and the apps/coder consumer stay compatible. Registered in
ALL_TOOLS + READ_ONLY_TOOL_NAMES.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
indifferentketchup
d05f73be26