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/explorations/.pi-map.index.md

@@ -0,0 +1,25 @@
+# openspec/explorations (index)
+dir: openspec/explorations
+
+## role
+Design exploration and technical specification documents for container instance management system features and architectural improvements.
+## 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-file-level-overlays.md
+- mount-specificity-ordering.md
+- ssh-key-mounting.md
+- streamline-tool-container-definitions.md
+- terminal-responsiveness.md
+## links
+index: openspec/explorations/.pi-map.index.md
+map: openspec/explorations/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/explorations/.pi-map.md

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+# openspec/explorations
+dir: openspec/explorations
+
+index: openspec/explorations/.pi-map.index.md
+
+## role
+Design exploration and technical specification documents for container instance management system features and architectural improvements.
+## files
+- config-profile-multi-repo-mounts.md | Proposes a design for supporting multiple directory mounts from a single git repository clone in config profiles, avoiding redundant clones.
+- home-path-expansion.md | Explores design options for expanding `~` and `$HOME` in container mount paths based on target container user context | dep: config_profile_resolver.py, tool_instances.py, manifest_compiler.py, Docker Compose
+- mount-file-level-overlays.md | Explains a bug where directory-level bind mounts hide sibling files and proposes file-level bind mounts as the solution for overlaying individual files without affecting their parent directories. | dep: Docker, os
+- mount-specificity-ordering.md | Design document proposing a solution to fix Docker mount ordering where broader parent-path mounts hide more specific child-path mounts by sorting volumes by target path depth | dep: Docker Compose, Linux mount system, manifest_compiler.py, tool_instances.py
+- ssh-key-mounting.md | Design document for adding SSH key mounting capability to config profiles in a container instance management system | dep: ssh_keys table, GitRepository, ConfigProfile, compose volume mounts, alembic migrations, React frontend
+- streamline-tool-container-definitions.md | Explores architectural redesign of a tool container definition system to replace monolithic Dockerfile strings and ad-hoc compose generation with a layered, declarative approach | dep: Docker, Docker Compose, SQLAlchemy, Python f-strings/Jinja, Ubuntu base images, Cloudflare tunnels, PTY/WebSocket terminals
+- terminal-responsiveness.md | Explores architectural improvements to achieve low-latency terminal I/O performance comparable to VS Code Server by identifying bottlenecks and proposing optimizations for a WebSocket-based web terminal. | dep: xterm.js, WebSocket, asyncio, select, docker, Python, TypeScript, React, node-pty, libuv, Docker Engine API
+## arch
+Markdown-based design documents following an exploratory RFC pattern, covering mount resolution algorithms, path expansion strategies, container definition layering, and WebSocket optimization techniques.
+## tags
+mounts, container, mount, py, path, design, config, level
+## symbols
+-
+## workflows
+-
+## dirty
+-