tasks: CalDAV provider (Nextcloud Tasks/iOS), review reports unknown values; bump stops pointing at release (#139)

Files changed:
- CHANGES.md
- INSTALL.md
- VERSION
- instructions/dev/version-parts.md
- instructions/gtd-weekly-review/SKILL.md
- tools/CONTRACT.md
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/version_cmd.py
- tools/chemenu/review.py
- tools/chemenu/tasks/__init__.py
- tools/chemenu/tasks/caldav.py
- tools/chemenu/tasks/config.py
- tools/chemenu/tests/test_caldav.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_review.py
- tools/requirements.txt

tools/chemenu/tasks/__init__.py

@@ -35,6 +35,11 @@ def build_reader(cfg: TasksConfig) -> TaskReader:
         if sp_cfg.access == sp.ACCESS_API:
             return sp.SuperProductivityApiReader(sp_cfg)
         return sp.SuperProductivityReader(sp_cfg)
+    if cfg.provider == "caldav":
+        from chemenu.tasks import caldav as cd
+
+        cd_cfg = cd.CalDAVConfig.from_dict(cfg.provider_config)
+        return cd.CalDAVReader(cd_cfg)
     raise ValidationError(f"No reader is wired up for task provider {cfg.provider!r}.")
 
 
@@ -61,4 +66,9 @@ def build_writer(cfg: TasksConfig, reader: TaskReader) -> TaskWriter:
                 "instance (Gitea #133)."
             )
         return sp.SuperProductivityWriter(sp_cfg, reader)
+    if cfg.provider == "caldav":
+        from chemenu.tasks import caldav as cd
+
+        cd_cfg = cd.CalDAVConfig.from_dict(cfg.provider_config)
+        return cd.CalDAVWriter(cd_cfg, reader)
     raise ValidationError(f"No writer is wired up for task provider {cfg.provider!r}.")