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/note_service.py

@@ -0,0 +1,65 @@
+"""Note service for note management."""
+
+from datetime import datetime
+
+from ..models import Session, NoteType, Note
+
+
+def add_note(session: Session, note_type: str, text: str) -> dict:
+    """
+    Add a note to the session and return the note dict.
+    Valid note types: work, change, blocker, decision, idea, reference
+    """
+    try:
+        note_type_enum = NoteType(note_type)
+    except ValueError:
+        raise ValueError(f"Invalid note type: {note_type}. Valid types are: {[t.value for t in NoteType]}")
+
+    note = Note(type=note_type_enum, text=text)
+    session.raw_notes.append(note.model_dump(mode="json"))
+
+    return {
+        "type": note.type.value,
+        "text": note.text,
+        "created_at": note.created_at.isoformat(),
+    }
+
+
+def consolidate_notes(raw_notes: list[dict]) -> dict:
+    """
+    Consolidate raw notes into categorized sections.
+    Returns dict with keys: work_done, changes, decisions, blockers, references
+    """
+    result = {
+        "work_done": [],
+        "changes": [],
+        "decisions": [],
+        "blockers": [],
+        "references": [],
+    }
+
+    for note in raw_notes:
+        if isinstance(note, dict):
+            note_type = note.get("type", "")
+            text = note.get("text", "")
+        else:
+            # Handle string format like "[type] text"
+            parts = note.split("]", 1)
+            if len(parts) == 2:
+                note_type = parts[0][1:]
+                text = parts[1].strip()
+            else:
+                continue
+
+        if note_type == NoteType.WORK.value:
+            result["work_done"].append(text)
+        elif note_type == NoteType.CHANGE.value:
+            result["changes"].append(text)
+        elif note_type == NoteType.DECISION.value:
+            result["decisions"].append(text)
+        elif note_type == NoteType.BLOCKER.value:
+            result["blockers"].append(text)
+        elif note_type == NoteType.REFERENCE.value:
+            result["references"].append(text)
+
+    return result