Server comments describe the code to a stranger (#6221)

Rule 32 "Comments describe the product to a stranger" sweep over
src/, alembic/ and tests/. Comments and docstrings now say what the code
does and the reason as a present-tense constraint, briefly.

Removed:
- issue, task, note, rule, milestone and family-idea references
- "used to" / before-and-after narration
- quotes of decisions and incident stories from the deploying instance
- paragraph-length arguments, where a line or two carries the fact

Kept every hazard as a present-tense fact, e.g. timing oracles, the
proxy hop direction, and migrations that must stay frozen.

Also:
- Three test names lose "still"/"used to"/"pre_m304" phrasing.
- pyproject's description drops "FabledSword family".

The history these comments carried stays in Scribe and in git log.
A comment-stripping diff (Scribe snippet #6226 "codeonly.py — prove a
diff changed only comments") shows no code changed apart from the
renamed tests and the description string.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

alembic/versions/0025_drop_note_kind.py

@@ -1,19 +1,11 @@
-"""drop notes.kind — a checklist is something a note HAS (M13 step 2)
+"""drop notes.kind — a checklist is something a note has
 
 Revision ID: 0025
 Revises: 0024
 Create Date: 2026-08-22
 
-`kind` was never a type: a plain TEXT column with no enum and no CHECK, compared
-against a hardcoded ("text", "list") tuple in six places. `note_items` was always an
-ordinary child table keyed by note_id, serialization always emitted `items` whatever
-the kind, and the Android editor already toggled between the two losslessly. The
-storage has modelled "a body plus optional checkable items" the whole time; only the
-gates forbade it.
-
-Nothing is lost. Items were already rows in their own table, and a note that was
-`kind = 'list'` keeps every one of them — it just stops being a different sort of
-thing from the note next to it.
+A note is a body plus optional checkable items. Items are rows in their own table,
+so a `kind = 'list'` note keeps every one.
 """
 from alembic import op
 import sqlalchemy as sa
@@ -29,7 +21,6 @@ def upgrade() -> None:
 
 
 def downgrade() -> None:
-    # server_default so existing rows get a value; every note comes back as 'text',
-    # which is right — a restored note with items would previously have hidden its
-    # body, and there is no record of which ones were once lists.
+    # server_default so existing rows get a value. Every note comes back as 'text':
+    # nothing records which were lists.
     op.add_column("notes", sa.Column("kind", sa.Text(), nullable=False, server_default="text"))