end-session: session lifecycle management infrastructure

- claude-sessions: registry manager with list/recover/spawn/resume/register/gc and interactive menu
- claude-sessions-shutdown: graceful systemd shutdown handler
- install-systemd.sh: idempotent service installer for new machines
- config/systemd/user/claude-sessions-save.service: versioned service definition
- README + CONTEXT updated

README.md

@@ -27,6 +27,12 @@ claude-foundations/
     set-topic.sh              # Set per-session topic for the status line
     extract-transcripts.py    # Transcript backup tracking: register, list, extract, mark-processed
     list-transcripts-here.sh  # Wrapper: extract-transcripts --list $(pwd) (skill bang-command safe)
+    claude-sessions           # Session lifecycle manager: registry, recover, interactive menu
+    claude-sessions-shutdown  # Graceful shutdown: send /exit-session to all Claude tmux sessions
+    install-systemd.sh        # Install the systemd shutdown service (idempotent, run on each new machine)
+  config/
+    systemd/user/
+      claude-sessions-save.service  # Systemd user service — graceful Claude exit before halt/reboot
   context/                 # Active work focus detail files
   memory/                  # Session logs and reflections
   settings.yaml            # Knowledge pipeline configuration
@@ -148,3 +154,6 @@ rm <file>.pre-lint
 | `scripts/set-topic.sh` | Set the session topic: `set-topic.sh <cwd> "topic text"` |
 | `scripts/extract-transcripts.py` | Transcript backup tracking — register backups, list unprocessed, extract conversation text, mark processed |
 | `scripts/list-transcripts-here.sh` | Wrapper calling `extract-transcripts.py --list $(pwd)` — used in `/log` skill pre-gathered context |
+| `scripts/claude-sessions` | Session lifecycle manager — registry, interactive menu, recover after restart, gc. Symlinked to `~/sbin/` |
+| `scripts/claude-sessions-shutdown` | Graceful shutdown — sends `/exit-session` to all Claude tmux sessions, waits, force-kills. Called by systemd |
+| `scripts/install-systemd.sh` | Install `config/systemd/user/claude-sessions-save.service` to `~/.config/systemd/user/`, enable and start |