v0.2.26

• Connect the configured mcp_servers in headless programmer run and
  programmer init, so the agent and its sub-agents get the same
  mcp__<server>__<tool> tools as the TUI. Previously headless runs started no
  MCP servers. Servers start after the work mode and classifier are validated;
  one that fails is skipped with a warning on stderr and the run continues.
• Connect MCP servers concurrently in both the TUI and headless runs. A slow or
  hung server now costs only its own handshake timeout instead of delaying every
  server configured after it. Startup errors keep configuration order, while
  connection status updates arrive in completion order.
• Share turn assembly between the TUI, headless runs, and sub-agents: one module
  installs the common tool providers, resolves the approval policy once for a
  parent and its children, and applies the same memory-model gate everywhere.
• Add regressions for shared assembly, the memory and classifier gates, headless
  MCP startup with a failing server, and concurrent startup past a hung server;
  update usage and architecture documentation.

Upgrade note: headless runs with mcp_servers configured now spend time
starting those servers before the first turn, and that time counts against
--timeout.

Full changelog: v0.2.25...v0.2.26