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/specs/ssh-keys/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/specs/ssh-keys
+dir: openspec/specs/ssh-keys
+
+index: openspec/specs/ssh-keys/.pi-map.index.md
+
+## role
+Defines security requirements for SSH key generation, storage, and access control for Git operations.
+## files
+- spec.md | Specifies requirements for generating, managing, and securing Ed25519 SSH keys for git operations with project-scoped access control. | dep: SSHKey, User, Project, cryptography, pytest, mypy, ruff, npm
+## arch
+Specification-driven security policy using Ed25519 cryptography with project-scoped RBAC for multi-tenant key isolation.
+## tags
+project, spec, specifies, requirements, generating, managing, securing, ed25519
+## symbols
+-
+## workflows
+-
+## dirty
+-