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/multi-session-terminal-ux/.pi-map.index.md

@@ -0,0 +1,26 @@
+# openspec/changes/multi-session-terminal-ux (index)
+dir: openspec/changes/multi-session-terminal-ux
+
+## role
+Open specification and design documentation for implementing multi-session terminal UX in a web-based tool instance platform
+## parent
+index: openspec/changes/.pi-map.index.md
+map: openspec/changes/.pi-map.md
+## children
+-
+## files
+- .openspec.yaml
+- apply-pr1.md
+- apply-pr2.md
+- apply-pr3.md
+- design.md
+- explore.md
+- proposal.md
+- tasks.md
+## links
+index: openspec/changes/multi-session-terminal-ux/.pi-map.index.md
+map: openspec/changes/multi-session-terminal-ux/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/changes/multi-session-terminal-ux/.pi-map.md

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+# openspec/changes/multi-session-terminal-ux
+dir: openspec/changes/multi-session-terminal-ux
+
+index: openspec/changes/multi-session-terminal-ux/.pi-map.index.md
+
+## role
+Open specification and design documentation for implementing multi-session terminal UX in a web-based tool instance platform
+## files
+- .openspec.yaml | Defines an open specification for a multi-session terminal user experience project
+- apply-pr1.md | Documents the implementation of database schema, Alembic migration, and TerminalManager multi-session core for a multi-session terminal UX feature. | dep: Alembic, SQLAlchemy, aiosqlite, asyncio, pytest, TerminalSession, TerminalManager, UUIDPrimaryKeyMixin, TimestampMixin, SessionLocal
+- apply-pr2.md | Empty file with no functionality
+- apply-pr3.md | Documents a pull request implementing a frontend multi-session terminal UI with tabbed management, fullscreen mode, keyboard shortcuts, and mobile support. | dep: React, TypeScript, WebSocket, CSS, Python (backend terminal manager), testing framework
+- design.md | Software design document specifying architecture and implementation for adding multi-session terminal support (up to 5 concurrent sessions) to an existing tool instance platform | dep: FastAPI, SQLAlchemy, Alembic, React, xterm.js, WebSocket, PTY, docker exec, Python, TypeScript
+- explore.md | Explores architectural options for adding multi-session terminal support to an existing persistent terminal system, evaluating backend, frontend, protocol, and database design choices with recommendations for MVP implementation. | dep: TerminalManager, TerminalSession, TerminalComponent, TerminalPage, MobileTerminalWrapper, xterm.js, FastAPI, SQLAlchemy, alembic
+- proposal.md | Proposes architectural changes to support multiple concurrent terminal sessions per tool instance with improved UI/UX features | dep: TerminalManager, TerminalSession, api/terminal.py, TerminalComponent, terminal.tsx, WebSocket protocol, database schema
+- tasks.md | A software design document detailing a 12-task implementation plan for adding multi-session terminal UX support to a web application, organized across 3 stacked pull requests with TDD acceptance criteria. | dep: Alembic, SQLAlchemy, FastAPI, WebSocket, React, TypeScript, xterm.js, PTY, UUID, pytest, Jest/RTL
+## arch
+Specification-driven incremental architecture using stacked PRs (backend→API→frontend), tabbed terminal UI with WebSocket protocol, database-backed session persistence, and TDD acceptance criteria
+## tags
+terminal, multi, session, apply, alembic, support, design, implementation
+## symbols
+-
+## workflows
+-
+## dirty
+-