chore: track all project map and index files

Add generated .pi-map.md and .pi-map.index.md files across the repository
so the project navigation maps are shared and versioned. These artifacts
are maintained by project_map_init/patch/validate and must be kept in
sync with source edits.

Note: .cache/ remains ignored (added in previous commit).

openspec/changes/archive/2026-05-19-tool-terminal/.pi-map.md

@@ -0,0 +1,21 @@
+# openspec/changes/archive/2026-05-19-tool-terminal
+dir: openspec/changes/archive/2026-05-19-tool-terminal
+
+index: openspec/changes/archive/2026-05-19-tool-terminal/.pi-map.index.md
+
+## role
+Design and planning documentation for a browser-based terminal interface feature enabling WebSocket-connected Docker container exec access.
+## files
+- design.md | Design document specifying a web-based terminal interface for Docker containers using WebSocket bidirectional streaming with xterm.js frontend and docker exec PTY backend. | dep: WebSocket, Docker, xterm.js, asyncio, subprocess, fcntl, xterm-addon-fit, xterm-addon-web-links
+- proposal.md | Proposes a browser-based terminal access system for Docker containers via WebSocket | dep: Docker, WebSocket, xterm.js, pseudo-TTY/PTY
+- tasks.md | Project task tracking document for implementing a WebSocket-based terminal feature using xterm.js and Docker exec | dep: FastAPI, WebSocket, asyncio-subprocess, xterm.js, xterm-addon-fit, xterm-addon-web-links, docker, PTY, React/Next.js
+## arch
+WebSocket bidirectional streaming architecture with xterm.js frontend terminal emulator, Docker exec PTY backend, and task-tracked phased implementation planning.
+## tags
+xterm, docker, websocket, js, addon, design, web, terminal
+## symbols
+-
+## workflows
+-
+## dirty
+-