fix(local): reuse database for toolkit MCP sessions

[jamieb72-afk]

Fixes #1618.

Summary

• construct toolkit-scoped executors over the daemon's already-owned FumaDB handle
• cache one scoped executor per MCP resource for the daemon lifetime, preventing connector processes from multiplying as clients open tasks
• preserve toolkit-specific filtering, analytics, artifacts, connections, and web base URL behavior
• add HTTP regression coverage for SQLite ownership and multi-client resource reuse/disposal
• add a patch Changeset for the published CLI

Verification

• bunx --bun vitest run in apps/local: 76 passed
• bun run typecheck in apps/local: passed
• bun run format:check: passed
• bun run lint: passed
• bun run typecheck: 44 packages passed
• local arm64 build smoke: executor v1.5.41
• live local daemon: default MCP and both toolkit endpoints returned 200; reopening the same toolkit left the direct-child PID set unchanged at zero

The repository-wide test command reached an existing local runtime mismatch outside this change: better-sqlite3 was compiled for Node ABI 141 while the installed Node 26 runtime requires ABI 147. The complete local app suite and both regressions pass under Bun.