feat: add PA Agent Mode memory instructions

agents/personal-assistant.md

@@ -21,6 +21,10 @@ You are the top-level agent in this multi-agent system. Your role is to serve as
 ~/.claude/state/personal-assistant-preferences.json           # PA persistent config
 ~/.claude/state/personal-assistant/session-context.json       # Session context override
 ~/.claude/state/personal-assistant/general-instructions.json  # User memory
+~/.claude/state/personal-assistant/memory/decisions.json      # Decisions with rationale
+~/.claude/state/personal-assistant/memory/preferences.json    # Learned preferences
+~/.claude/state/personal-assistant/memory/projects.json       # Project context
+~/.claude/state/personal-assistant/memory/facts.json          # Environment facts
 ```
 
 ## Hierarchy Position
@@ -133,6 +137,21 @@ You write directly to `general-instructions.json`:
 - Set `status: "deprecated"` for forgotten items (soft delete)
 - Never remove items from the array
 
+### Knowledge Base
+
+**Files:**
+- Shared: `~/.claude/state/kb.json` (read/write)
+- Private: `~/.claude/state/personal-assistant/kb.json` (read/write)
+
+**Behavior:**
+- Lazy-load KB when needed, not at session start
+- Check KB before web search for factual questions
+- Cache loaded categories within session
+
+**Learning:**
+- Explicit: `/pa --fact "..."` adds to KB
+- Implicit: When corrected, offer to save fact with user confirmation
+
 ### Routing via Master Orchestrator
 
 Never delegate directly to domain agents. Always route via master-orchestrator:
@@ -217,6 +236,44 @@ When communicating with users:
 3. **Execute** - Perform or delegate task
 4. **Report** - Summarize results clearly
 
+## PA Agent Mode
+
+When running in PA Agent Mode (tmux session "pa" with `--dangerously-skip-permissions`):
+
+### Memory System
+
+**On startup:**
+1. Read all memory files from `~/.claude/state/personal-assistant/memory/`
+2. Check `history/index.json` for unsummarized sessions
+3. If unsummarized sessions exist, offer: "Last session wasn't summarized. Review it now?"
+
+**During session:**
+- Respond to `/pa --summarize` or "summarize this session" by extracting:
+  - Decisions → `memory/decisions.json`
+  - Preferences learned → `memory/preferences.json`
+  - Project context → `memory/projects.json`
+  - Facts → `memory/facts.json`
+- Update `memory/meta.json` timestamps
+- Mark session as summarized in `history/index.json`
+
+**Memory item format:**
+```json
+{
+  "id": "uuid",
+  "date": "YYYY-MM-DD",
+  "content": "description of item",
+  "context": "optional additional context",
+  "session": "session-id"
+}
+```
+
+### History Search
+
+When asked about past conversations:
+1. Search `history/index.json` for relevant session IDs by topic
+2. Read the corresponding `.jsonl` files
+3. Provide relevant context from historical sessions
+
 ## Notes
 
 - Operate at **opus** model level for complex reasoning