Android comments describe the code to a stranger (#6223)

Milestone 546 "Bring the repo to the comment standard (rule 32) and
compose defaults (rule 198)", step #6223 "Comment standard sweep:
Android client".

KDoc, comments, manifest and resource notes, Gradle and TOML comments
and the ffi crate's docs now state what the code does and the
non-obvious why in the present tense. Issue, Scribe-note, milestone
(M13, M304, M315, M12) and family-idea references are gone, as are
comparisons to Minstrel and the narration of what used to be: the
capture sheet the editor replaced, the per-note colour story, the
operator's device-pass feedback, the bindgen-as-[[bin]] failure, the
0.60 edge alpha before it was re-solved, and the checker bugs behind
check-strings/check-symbols. Hazards stay as facts: the signing key that
can't be rotated, the alias that keeps the earlier name, PKCS12's single
password, unwind over abort, the UTC date-picker read, the
DerivedTint/colors.ts mirror.

One stale claim is gone: DerivedTint said the web had no test runner,
but notes/grammar.test.ts runs the same tint cases. detekt.yml said
"these two places" over a list of five.

49 files, comments only: a comment-stripping diff of every changed file
against HEAD is identical.

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

android/config/detekt.yml

@@ -1,8 +1,8 @@
 # Per-rule overrides layered on top of detekt's defaults
 # (`--build-upon-default-config` on the CLI invocation in the Android lane).
 #
-# The pre-2.0 `build:` top-level was removed; failure is controlled by the CLI's
-# exit code instead.
+# Failure is controlled by the CLI's exit code; detekt 2 has no `build:`
+# top-level.
 
 naming:
   # Composables conventionally use PascalCase function names. Matches every
@@ -49,7 +49,7 @@ complexity:
 
 exceptions:
   TooGenericExceptionCaught:
-    # Catching broadly is DELIBERATE in these two places, and each site says so.
+    # Catching broadly is DELIBERATE in these places, and each site says so.
     #
     #   * the ViewModel — a note that fails to save must become a visible error
     #     banner, never a crash. Narrowing this would mean an unanticipated