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

CONTEXT.md

@@ -2,6 +2,15 @@
 
 Current work focus and active tasks. Used by `context-load` to orient agents at session start.
 
+## Pending Push
+
+Three repos committed locally, not yet pushed (SSH key `gitea.ai-enablement.2026` required):
+- `claude-foundations`: session lifecycle scripts + systemd config (`install-systemd.sh`, `claude-sessions-shutdown`, `claude-sessions`, `config/systemd/user/`)
+- `custom-claude-skills`: `/exit-session` skill + `--all-profiles` flag in `install.sh`
+- `small-scripts`: `claude-tmux` registry hook
+
+Recovery: `ssh-add ~/.ssh/gitea.ai-enablement.2026` then push each repo.
+
 ## Active
 
 - [Context loading improvements](context/context-loading.md) — Testing and refining the `context-load` and `start-claude` scripts