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/designs/.pi-map.index.md

@@ -0,0 +1,23 @@
+# openspec/designs (index)
+dir: openspec/designs
+
+## role
+Contains design documents specifying architectural decisions and feature specifications for the OpenSpec containerized development environment platform.
+## parent
+index: openspec/.pi-map.index.md
+map: openspec/.pi-map.md
+## children
+-
+## files
+- config-profile-multi-repo-mounts.md
+- home-path-expansion.md
+- mount-specificity-ordering.md
+- terminal-responsiveness.md
+- tool-definition-manifest.md
+## links
+index: openspec/designs/.pi-map.index.md
+map: openspec/designs/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/designs/.pi-map.md

@@ -0,0 +1,23 @@
+# openspec/designs
+dir: openspec/designs
+
+index: openspec/designs/.pi-map.index.md
+
+## role
+Contains design documents specifying architectural decisions and feature specifications for the OpenSpec containerized development environment platform.
+## files
+- config-profile-multi-repo-mounts.md | Design document for extending git mount configuration to support multiple source-to-target mappings per repository in a config profile system. | dep: JSONB, Python, TypeScript, React, os.path, glob expansion, config profile API, tool instances API
+- home-path-expansion.md | Design document for implementing `~` and `$HOME` expansion in container mount paths based on manifest user configuration | dep: config_profile_resolver.py, manifest_compiler.py, tool_instances.py, os
+- mount-specificity-ordering.md | Defines a design for sorting Docker volume mounts by target path depth to ensure more specific mounts take precedence, with duplicate detection warnings. | dep: docker.py, manifest_compiler.py, tool_instances.py, collections.Counter, logging
+- terminal-responsiveness.md | Design document for a high-performance web terminal rewrite using asyncio-native I/O, binary WebSocket frames, output batching, flow control, and WebGL rendering. | dep: asyncio, pty, os, time, collections.deque, xterm.js, xterm-addon-webgl, WebSocket, docker, JSON
+- tool-definition-manifest.md | Defines a system for creating, validating, and compiling tool definition manifests into Dockerfiles, Docker Compose files, and entrypoint scripts for containerized development environments. | dep: Docker, PostgreSQL, Python (json, hashlib, shlex, yaml, subprocess), JSON Schema, deb/nodesource package repositories
+## arch
+Markdown-based design document collection using iterative specification pattern; each document follows a structured RFC-style format with problem statement, design, and implementation considerations covering container orchestration, filesystem mounts, terminal I/O, and tool manifest compilation.
+## tags
+py, docker, design, mount, path, mounts, document, config
+## symbols
+-
+## workflows
+-
+## dirty
+-