feat: filter Wishlist from --my-tasks; document the mode (#71)

Tasks in the "Wishlist" bucket version are now excluded from the list
and summary entirely (no due date, noise backlog); exact case match,
tasks without a version are unaffected. Document --my-tasks in README
and the user guide (sorting, summary metrics, OSC 8 links, stream
separation); all examples use synthetic data. Declare ruff
known-first-party in pyproject so the lint result is CWD-independent.

pyproject.toml

@@ -62,3 +62,6 @@ ignore_missing_imports = true
 
 [tool.isort]
 profile = "black"
+
+[tool.ruff.lint.isort]
+known-first-party = ["redmine_reporter"]