Codex/agent-neutral setup, terminal IME fix, hide own overlay cursor

- Write AGENTS.md (the cross-tool agent-instructions standard) at the
  project root alongside .claude/CLAUDE.md, generated from one guide;
  includes an Agent Setup section with the project-specific Codex MCP
  registration command. AGENTS.md is excluded from Overleaf sync.
- MCP server resolves the project directory from its own script location
  when cwd doesn't contain the state file, so clients that launch MCP
  servers from a global config (Codex) work without special setup
- Terminal: swallow the duplicate compositionend commit when switching
  input sources mid-composition (xterm finalizes on the keydown and then
  again on compositionend, sending pinyin text twice)
- Don't render our own colored overlay cursor — the native caret already
  marks our position; overlay cursors are collaborators-only (web parity)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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