v1.11.0

A controller feature release over 1.10.2: a lean MCP tool profile and tool packs. The client,
LangChain and MCP bridge packages change only in version; update the controller image to get it.

Upgrade notes: nothing changes for a controller that doesn't set MCP_TOOL_PACKS and keeps
MCP_TOOL_PROFILE at curated or full. Those two serve the same tools, in the same order, with
the same descriptors as 1.10.2. A misspelt MCP_TOOL_PROFILE still serves curated, but now logs a
warning. The error text for a call to a tool the controller doesn't serve has changed (below). Update
anything that matches the old text.

Added

• A lean MCP tool profile, and tool packs you compose by name. Every MCP tool now belongs to one
  of 21 packs (browse, sessions, tabs, downloads, devtools, harness, …), and a profile is a
  list of packs. MCP_TOOL_PROFILE=lean serves only browse: browser.observe, browser.screenshot,
  browser.execute_action, browser.get_html, browser.find_elements, browser.request_human_takeover
  and browser.close_session, about 12 KB of tools/list against curated's 25 KB.
  MCP_TOOL_PACKS=tabs,downloads adds packs to any profile and -scripting removes one; an unknown pack
  name stops the controller at startup, with the valid names in the error. curated (still the default)
  and full list the same tools, in the same order, with the same descriptors as before. The
  initialize instructions name only the tools the controller serves, the startup log says what is
  served, and the pack table is in docs/mcp-clients.md.

Changed

• An unrecognised MCP_TOOL_PROFILE now logs a warning. Any value other than full used to mean
  curated without a word, FULL, full and leen included. It still serves curated, and the
  startup log now says so and, when one is close, names the closest profile:
  MCP_TOOL_PROFILE='leen' is not a tool profile (did you mean lean?); serving curated. Use lean, curated or full.
  Unset, empty or blank still means curated, silently.
• A call to a tool outside the selection names its pack. It used to say the tool "is in the full MCP
  tool profile"; it now says, for example, browser.get_console is in the devtools tool pack, which this controller does not serve (it serves the curated profile). To use it, add devtools to MCP_TOOL_PACKS or set MCP_TOOL_PROFILE=full on the controller.