chore: archive 15 completed OpenSpec changes

Move the following audited-and-implemented changes into
openspec/changes/archive/2026-06-12-completed-changes-archive/:

- backend-frontend-refactoring
- config-profile-git-mounts
- config-profile-includes-ui
- config-profile-multi-repo-mounts
- container-monitoring-notifications
- git-mount-url-validation
- home-path-expansion
- mobile-terminal-ux
- mount-specificity-ordering
- notification-center
- persistent-terminal-sessions
- session-list-overhaul
- ssh-key-mounting
- terminal-fullscreen-unified-header
- tool-session-progress-and-updates

Also regenerated .pi-map*.md files for openspec/changes so the
remaining active changes (multi-session-terminal-ux, reorganize-long-files,
working-copies, workspace-first-ui) reflect the new layout.

openspec/changes/archive/2025-05-17-user-profile/specs/.pi-map.index.md

@@ -1,19 +1,19 @@
-# openspec/changes/archive/2025-05-17-user-profile/specs (index)
-dir: openspec/changes/archive/2025-05-17-user-profile/specs
+# archive/2025-05-17-user-profile/specs (index)
+dir: archive/2025-05-17-user-profile/specs
 
 ## role
-Contains archived user profile specification documents from a specific date snapshot in the OpenSpec changes tracking system.
+Contains specification documents for the user profile feature that was archived on May 17, 2025.
 ## parent
-index: openspec/changes/archive/2025-05-17-user-profile/.pi-map.index.md
-map: openspec/changes/archive/2025-05-17-user-profile/.pi-map.md
+index: archive/2025-05-17-user-profile/.pi-map.index.md
+map: archive/2025-05-17-user-profile/.pi-map.md
 ## children
-- openspec/changes/archive/2025-05-17-user-profile/specs/user-profile
-  index: openspec/changes/archive/2025-05-17-user-profile/specs/user-profile/.pi-map.index.md
-  map: openspec/changes/archive/2025-05-17-user-profile/specs/user-profile/.pi-map.md
+- archive/2025-05-17-user-profile/specs/user-profile
+  index: archive/2025-05-17-user-profile/specs/user-profile/.pi-map.index.md
+  map: archive/2025-05-17-user-profile/specs/user-profile/.pi-map.md
 ## files
 ## links
-index: openspec/changes/archive/2025-05-17-user-profile/specs/.pi-map.index.md
-map: openspec/changes/archive/2025-05-17-user-profile/specs/.pi-map.md
+index: archive/2025-05-17-user-profile/specs/.pi-map.index.md
+map: archive/2025-05-17-user-profile/specs/.pi-map.md
 ## workflows
 -
 ## dirty

openspec/changes/archive/2025-05-17-user-profile/specs/.pi-map.md

@@ -1,13 +1,13 @@
-# openspec/changes/archive/2025-05-17-user-profile/specs
-dir: openspec/changes/archive/2025-05-17-user-profile/specs
+# archive/2025-05-17-user-profile/specs
+dir: archive/2025-05-17-user-profile/specs
 
-index: openspec/changes/archive/2025-05-17-user-profile/specs/.pi-map.index.md
+index: archive/2025-05-17-user-profile/specs/.pi-map.index.md
 
 ## role
-Contains archived user profile specification documents from a specific date snapshot in the OpenSpec changes tracking system.
+Contains specification documents for the user profile feature that was archived on May 17, 2025.
 ## files
 ## arch
-Simple directory-based archival storage using date-scoped namespacing (YYYY-MM-DD-feature) for immutable specification snapshots with no active code architecture.
+N/A (no code files present; directory contains only archived specification documents)
 ## tags
 -
 ## symbols

openspec/changes/archive/2025-05-17-user-profile/specs/user-profile/.pi-map.index.md

@@ -1,18 +1,18 @@
-# openspec/changes/archive/2025-05-17-user-profile/specs/user-profile (index)
-dir: openspec/changes/archive/2025-05-17-user-profile/specs/user-profile
+# archive/2025-05-17-user-profile/specs/user-profile (index)
+dir: archive/2025-05-17-user-profile/specs/user-profile
 
 ## role
-Defines functional specifications for a user profile management system including profile retrieval, updates, and local avatar storage.
+Defines functional specifications for user profile management capabilities including profile data operations and avatar handling
 ## parent
-index: openspec/changes/archive/2025-05-17-user-profile/specs/.pi-map.index.md
-map: openspec/changes/archive/2025-05-17-user-profile/specs/.pi-map.md
+index: archive/2025-05-17-user-profile/specs/.pi-map.index.md
+map: archive/2025-05-17-user-profile/specs/.pi-map.md
 ## children
 -
 ## files
 - spec.md
 ## links
-index: openspec/changes/archive/2025-05-17-user-profile/specs/user-profile/.pi-map.index.md
-map: openspec/changes/archive/2025-05-17-user-profile/specs/user-profile/.pi-map.md
+index: archive/2025-05-17-user-profile/specs/user-profile/.pi-map.index.md
+map: archive/2025-05-17-user-profile/specs/user-profile/.pi-map.md
 ## workflows
 -
 ## dirty

openspec/changes/archive/2025-05-17-user-profile/specs/user-profile/.pi-map.md

@@ -1,14 +1,14 @@
-# openspec/changes/archive/2025-05-17-user-profile/specs/user-profile
-dir: openspec/changes/archive/2025-05-17-user-profile/specs/user-profile
+# archive/2025-05-17-user-profile/specs/user-profile
+dir: archive/2025-05-17-user-profile/specs/user-profile
 
-index: openspec/changes/archive/2025-05-17-user-profile/specs/user-profile/.pi-map.index.md
+index: archive/2025-05-17-user-profile/specs/user-profile/.pi-map.index.md
 
 ## role
-Defines functional specifications for a user profile management system including profile retrieval, updates, and local avatar storage.
+Defines functional specifications for user profile management capabilities including profile data operations and avatar handling
 ## files
 - spec.md | Defines functional specifications for a user profile management system including profile retrieval, updates, and local avatar storage | dep: auth-oauth, User database model, pytest, mypy, ruff, npm/typecheck, npm/lint
 ## arch
-Specification-driven design using markdown-based documentation with date-versioned archiving for change tracking.
+Specification-driven design using markdown-based requirements documentation with modular feature decomposition (retrieval, updates, local storage)
 ## tags
 profile, npm, spec, defines, functional, specifications, user, management
 ## symbols