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/review.py

@@ -35,6 +35,17 @@ CHECK_UNPAGED_PROJECT = "unpaged_project"
 CHECK_NO_OPEN_LOOP = "no_open_loop"
 CHECK_SOMEDAY_STALE = "someday_stale"
 
+# D3 (Gitea #139): a value a provider could not supply is reported as its own
+# finding, under checks 2 and 3 respectively, rather than silently skipped -
+# a real state both `superproductivity` (a task with neither `dueWithTime`
+# nor `dueDay`) and `caldav` (no server in the account returns
+# `DAV:creationdate`, so `created` falls back to the earliest item's own
+# `CREATED`, `None` for an empty project) can produce. Not separate entries
+# in `ALL_CHECKS`: each fires from within check 2's/check 3's own loop, so
+# the five-checks-run count is unaffected.
+CHECK_WAITING_NO_FOLLOWUP = "waiting_no_follow_up"
+CHECK_PROJECT_AGE_UNKNOWN = "project_age_unknown"
+
 # The checks that need the full tracker project list (#119 D26 checks 1/2/3/4)
 # - `projects()` failing skips all four together, since none of them can be
 # answered from `someday_items()` alone.
@@ -187,10 +198,19 @@ def run_review(root: Path, *, today: Optional[date] = None) -> ReviewReport:
         checks_run.append(CHECK_STALLED)
 
         # Check 2 - waiting-for overdue: any WAITING item whose follow_up_at
-        # is older than the threshold (#119 D9/D30 - never the due date).
+        # is older than the threshold (#119 D9/D30 - never the due date). A
+        # WAITING item with no follow_up_at at all is its own finding (D3),
+        # not a silent skip - the provider genuinely has nothing to judge
+        # staleness against.
         for _key, (name, items) in open_items_by_key.items():
             for item in items.waiting:
                 if item.follow_up_at is None:
+                    findings.append(Finding(
+                        CHECK_WAITING_NO_FOLLOWUP, name,
+                        f"'{item.title}' is WAITING but has no follow_up_at - cannot judge "
+                        "whether it is overdue.",
+                        item_id=item.id,
+                    ))
                     continue
                 age_days = (today - item.follow_up_at).days
                 if age_days > cfg.thresholds.stalled_waiting_days:
@@ -204,9 +224,18 @@ def run_review(root: Path, *, today: Optional[date] = None) -> ReviewReport:
 
         # Check 3 - tracker project with no kb/ page, older than the
         # threshold (#119 D26's noise brake: an age threshold, not a marker).
+        # A project with no determinable creation date is its own finding
+        # (D3), not a silent skip - check 3 cannot judge its age either way.
         for project in tracker_projects:
             key = normalize_project_name(project.name)
-            if key in kb_projects or project.created is None:
+            if key in kb_projects:
+                continue
+            if project.created is None:
+                findings.append(Finding(
+                    CHECK_PROJECT_AGE_UNKNOWN, project.name,
+                    "No creation date available for this tracker project - cannot judge "
+                    "whether it needs a kb/ page yet.",
+                ))
                 continue
             age_weeks = _weeks_between(project.created, today)
             if age_weeks > cfg.thresholds.unpaged_project_weeks: