feat(templates): add goal hierarchy tracker (Paperclip pattern)

Session 4 step 15 — GOALS.md hierarchy (objectives > initiatives > tasks)
and goal-tracker.sh for status/context/complete operations.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/templates/goals/README.md

@@ -0,0 +1,40 @@
+# Goal Hierarchy
+
+File-based goal hierarchy inspired by Paperclip's goal system.
+
+## Design decisions
+
+- **Simple parent_id, not recursive**: Each goal references its parent by ID.
+  No recursive traversal at runtime — matching Paperclip's actual implementation
+  (not their aspirational docs which describe "full ancestry").
+- **Dot notation for hierarchy**: G1 → G1.1 → G1.1.1 makes the hierarchy visible
+  in the ID itself.
+- **File-based, not database**: Human-editable, version-controlled, no dependencies.
+
+## Goal levels
+
+| Level | ID pattern | Example | Description |
+|-------|-----------|---------|-------------|
+| Company | G1, G2 | G1 | Top-level organizational goals |
+| Project | G1.1, G1.2 | G1.1 | Goals that support a company goal |
+| Task | G1.1.1 | G1.1.1 | Specific tasks assigned to agents |
+
+## Usage
+
+```bash
+# View goal summary
+./goal-tracker.sh
+
+# Mark a task as complete
+./goal-tracker.sh complete G1.1.1
+
+# Generate context for heartbeat injection
+./goal-tracker.sh context
+```
+
+## Integration with heartbeat
+
+The `context` command produces a summary suitable for injection into
+the heartbeat context packet (see `scripts/templates/heartbeat/context-packet.md`).
+The heartbeat runner can call `./goal-tracker.sh context` and inject
+the output as `{{ACTIVE_GOALS}}`.