feat: add ALIVE Context System memory provider

[benslockedin]

Summary

Adds ALIVE Context System as the 9th memory provider for Hermes Agent. ALIVE is a Personal Context Manager (PCM) — it gives Hermes persistent, structured world context across sessions.

3 tools:

• alive_world — discover and survey all walnuts (context units)
• alive_load — load a walnut's full briefing into conversation
• alive_search — search across walnuts for decisions, people, files

Key features:

• Smart prefetch — injects context only when needed (turn 0, walnut switch, post-compress, orientation)
• Session end persistence — stash saved to .alive/stash.json, squirrel YAML written for continuity
• Lean system prompt (~25 tokens) — announces availability without dumping context
• Follows the existing provider pattern (Honcho, Mem0, etc.)

3 files, 940 lines:

• plugins/memory/alive/__init__.py (838 lines)
• plugins/memory/alive/plugin.yaml (13 lines)
• plugins/memory/alive/README.md (89 lines)

Requires ALIVE Context System installed: claude plugin install alive@alivecontext

Docs: https://github.com/alivecontext/alive

Test plan

• from plugins.memory.alive import ALIVEProvider; p = ALIVEProvider(); print(p.is_available())
• Test alive_world returns walnut list from a configured ALIVE world
• Test alive_load returns full briefing for a known walnut
• Test smart prefetch fires on turn 0, skips on subsequent turns
• Test on_session_end writes stash + squirrel YAML
• Verify no interference with other memory providers when ALIVE is not installed

🤖 Generated with Claude Code