Implement storage layer for MVP-1 Personal Tracker CLI

Add storage layer with FileStorage, MarkdownReader, and MarkdownWriter classes.
Add data models (Project, Session, Note, Change).

tracker/services/summary_service.py

@@ -0,0 +1,42 @@
+"""Summary service for heuristic summary generation."""
+
+from ..models import Session
+from .note_service import consolidate_notes
+
+
+def generate_summary(session: Session) -> str:
+    """
+    Generate a heuristic summary from the session.
+    Uses consolidate_notes to extract work_done, decisions, blockers.
+    """
+    # Consolidate raw notes into categorized sections
+    consolidated = consolidate_notes(session.raw_notes)
+
+    lines = []
+
+    # Work done section
+    if consolidated["work_done"]:
+        lines.append("Trabajo realizado:")
+        for item in consolidated["work_done"]:
+            lines.append(f"  - {item}")
+        lines.append("")
+
+    # Decisions section
+    if consolidated["decisions"]:
+        lines.append("Decisiones:")
+        for item in consolidated["decisions"]:
+            lines.append(f"  - {item}")
+        lines.append("")
+
+    # Blockers section
+    if consolidated["blockers"]:
+        lines.append("Bloqueos:")
+        for item in consolidated["blockers"]:
+            lines.append(f"  - {item}")
+        lines.append("")
+
+    # If no content, provide a minimal summary
+    if not lines:
+        return f"Session de {session.duration_minutes} minutos sin progreso registrado."
+
+    return "\n".join(lines)