move pi-mono into companion-cloud as apps/companion-os

- Copy all pi-mono source into apps/companion-os/ - Update Dockerfile to COPY pre-built binary instead of downloading from GitHub Releases - Update deploy-staging.yml to build pi from source (bun compile) before Docker build - Add apps/companion-os/** to path triggers - No more cross-repo dispatch needed Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-15 19:05:14 +00:00 · 2026-03-07 09:22:50 -08:00 · 2026-03-07 09:22:50 -08:00 · 0250f72976
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+# Session Tree Navigation
+
+The `/tree` command provides tree-based navigation of the session history.
+
+## Overview
+
+Sessions are stored as trees where each entry has an `id` and `parentId`. The "leaf" pointer tracks the current position. `/tree` lets you navigate to any point and optionally summarize the branch you're leaving.
+
+### Comparison with `/fork`
+
+| Feature | `/fork`                                | `/tree`                                |
+| ------- | -------------------------------------- | -------------------------------------- |
+| View    | Flat list of user messages             | Full tree structure                    |
+| Action  | Extracts path to **new session file**  | Changes leaf in **same session**       |
+| Summary | Never                                  | Optional (user prompted)               |
+| Events  | `session_before_fork` / `session_fork` | `session_before_tree` / `session_tree` |
+
+## Tree UI
+
+```
+├─ user: "Hello, can you help..."
+│  └─ assistant: "Of course! I can..."
+│     ├─ user: "Let's try approach A..."
+│     │  └─ assistant: "For approach A..."
+│     │     └─ [compaction: 12k tokens]
+│     │        └─ user: "That worked..."  ← active
+│     └─ user: "Actually, approach B..."
+│        └─ assistant: "For approach B..."
+```
+
+### Controls
+
+| Key           | Action                                            |
+| ------------- | ------------------------------------------------- |
+| ↑/↓           | Navigate (depth-first order)                      |
+| Enter         | Select node                                       |
+| Escape/Ctrl+C | Cancel                                            |
+| Ctrl+U        | Toggle: user messages only                        |
+| Ctrl+O        | Toggle: show all (including custom/label entries) |
+
+### Display
+
+- Height: half terminal height
+- Current leaf marked with `← active`
+- Labels shown inline: `[label-name]`
+- Default filter hides `label` and `custom` entries (shown in Ctrl+O mode)
+- Children sorted by timestamp (oldest first)
+
+## Selection Behavior
+
+### User Message or Custom Message
+
+1. Leaf set to **parent** of selected node (or `null` if root)
+2. Message text placed in **editor** for re-submission
+3. User edits and submits, creating a new branch
+
+### Non-User Message (assistant, compaction, etc.)
+
+1. Leaf set to **selected node**
+2. Editor stays empty
+3. User continues from that point
+
+### Selecting Root User Message
+
+If user selects the very first message (has no parent):
+
+1. Leaf reset to `null` (empty conversation)
+2. Message text placed in editor
+3. User effectively restarts from scratch
+
+## Branch Summarization
+
+When switching branches, user is presented with three options:
+
+1. **No summary** - Switch immediately without summarizing
+2. **Summarize** - Generate a summary using the default prompt
+3. **Summarize with custom prompt** - Opens an editor to enter additional focus instructions that are appended to the default summarization prompt
+
+### What Gets Summarized
+
+Path from old leaf back to common ancestor with target:
+
+```
+A → B → C → D → E → F  ← old leaf
+        ↘ G → H        ← target
+```
+
+Abandoned path: D → E → F (summarized)
+
+Summarization stops at:
+
+1. Common ancestor (always)
+2. Compaction node (if encountered first)
+
+### Summary Storage
+
+Stored as `BranchSummaryEntry`:
+
+```typescript
+interface BranchSummaryEntry {
+  type: "branch_summary";
+  id: string;
+  parentId: string; // New leaf position
+  timestamp: string;
+  fromId: string; // Old leaf we abandoned
+  summary: string; // LLM-generated summary
+  details?: unknown; // Optional hook data
+}
+```
+
+## Implementation
+
+### AgentSession.navigateTree()
+
+```typescript
+async navigateTree(
+  targetId: string,
+  options?: {
+    summarize?: boolean;
+    customInstructions?: string;
+    replaceInstructions?: boolean;
+    label?: string;
+  }
+): Promise<{ editorText?: string; cancelled: boolean }>
+```
+
+Options:
+
+- `summarize`: Whether to generate a summary of the abandoned branch
+- `customInstructions`: Custom instructions for the summarizer
+- `replaceInstructions`: If true, `customInstructions` replaces the default prompt instead of being appended
+- `label`: Label to attach to the branch summary entry (or target entry if not summarizing)
+
+Flow:
+
+1. Validate target, check no-op (target === current leaf)
+2. Find common ancestor between old leaf and target
+3. Collect entries to summarize (if requested)
+4. Fire `session_before_tree` event (hook can cancel or provide summary)
+5. Run default summarizer if needed
+6. Switch leaf via `branch()` or `branchWithSummary()`
+7. Update agent: `agent.replaceMessages(sessionManager.buildSessionContext().messages)`
+8. Fire `session_tree` event
+9. Notify custom tools via session event
+10. Return result with `editorText` if user message was selected
+
+### SessionManager
+
+- `getLeafUuid(): string | null` - Current leaf (null if empty)
+- `resetLeaf(): void` - Set leaf to null (for root user message navigation)
+- `getTree(): SessionTreeNode[]` - Full tree with children sorted by timestamp
+- `branch(id)` - Change leaf pointer
+- `branchWithSummary(id, summary)` - Change leaf and create summary entry
+
+### InteractiveMode
+
+`/tree` command shows `TreeSelectorComponent`, then:
+
+1. Prompt for summarization
+2. Call `session.navigateTree()`
+3. Clear and re-render chat
+4. Set editor text if applicable
+
+## Hook Events
+
+### `session_before_tree`
+
+```typescript
+interface TreePreparation {
+  targetId: string;
+  oldLeafId: string | null;
+  commonAncestorId: string | null;
+  entriesToSummarize: SessionEntry[];
+  userWantsSummary: boolean;
+  customInstructions?: string;
+  replaceInstructions?: boolean;
+  label?: string;
+}
+
+interface SessionBeforeTreeEvent {
+  type: "session_before_tree";
+  preparation: TreePreparation;
+  signal: AbortSignal;
+}
+
+interface SessionBeforeTreeResult {
+  cancel?: boolean;
+  summary?: { summary: string; details?: unknown };
+  customInstructions?: string; // Override custom instructions
+  replaceInstructions?: boolean; // Override replace mode
+  label?: string; // Override label
+}
+```
+
+Extensions can override `customInstructions`, `replaceInstructions`, and `label` by returning them from the `session_before_tree` handler.
+
+### `session_tree`
+
+```typescript
+interface SessionTreeEvent {
+  type: "session_tree";
+  newLeafId: string | null;
+  oldLeafId: string | null;
+  summaryEntry?: BranchSummaryEntry;
+  fromHook?: boolean;
+}
+```
+
+### Example: Custom Summarizer
+
+```typescript
+export default function (pi: HookAPI) {
+  pi.on("session_before_tree", async (event, ctx) => {
+    if (!event.preparation.userWantsSummary) return;
+    if (event.preparation.entriesToSummarize.length === 0) return;
+
+    const summary = await myCustomSummarizer(
+      event.preparation.entriesToSummarize,
+    );
+    return { summary: { summary, details: { custom: true } } };
+  });
+}
+```
+
+## Error Handling
+
+- Summarization failure: cancels navigation, shows error
+- User abort (Escape): cancels navigation
+- Hook returns `cancel: true`: cancels navigation silently