Move trace project to root and rebrand from fnote

- Move all project files from `trace/` subdirectory to the repository root
- Rename directory structure from `fnote` to `trace`
- Update package references and imports (fnote -> trace)
- Update application branding and storage paths (~/.trace)
- Update build script and documentation
- Ensure __pycache__ is ignored

build_binary.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+set -e
+
+# Clean previous builds
+rm -rf build dist *.spec
+
+# Build the single-file executable
+# --paths .: Add current directory to search path so 'trace' package is found
+pyinstaller --onefile \
+            --name trace \
+            --clean \
+            --paths . \
+            --hidden-import curses \
+            main.py
+
+echo "Build complete. Binary is at dist/trace"