stack: Provider-Schicht für Aufgaben-Tracker mit Super-Productivity-Adapter (#124)

Files changed:
- .gitignore
- CHANGES.md
- VERSION
- tools/CONTRACT.md
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/config.py
- tools/chemenu/errors.py
- tools/chemenu/tasks/__init__.py
- tools/chemenu/tasks/config.py
- tools/chemenu/tasks/protocol.py
- tools/chemenu/tasks/superproductivity.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_superproductivity.py
- tools/chemenu/tests/test_tasks_config.py
- tools/chemenu/tests/test_tasks_protocol.py

tools/chemenu/tasks/__init__.py

@@ -0,0 +1,12 @@
+"""The task-tracker provider layer (Gitea #124, #119 D2/D3/D25).
+
+`kb/` owns a project's durable memory; a task tracker owns its momentary open
+loops (#119 D1). This package is the one place `wikitool` crosses that line -
+never an instruction, never a second MCP server (#119 D25): a provider is a
+Python object behind `chemenu.tasks.protocol.TaskReader`/`TaskWriter`, and
+everything above this package (the future `wikitool review`/`new project`
+commands, #125/#126) talks to that protocol and nothing provider-specific.
+
+No command lives here yet - this package is a library, per #124's own scope
+note ("Kein Kommando. Diese Schicht ist Bibliothek").
+"""