android: restore the dismiss I deleted, and teach the checker to see it

`785ebdb` failed at compileDebugKotlin with two `Unresolved reference 'dismiss'`.
Splitting the reminder notification code into its own object, I removed
`dismiss` from `Reminders` and never pasted it into `ReminderNotification`. The
call sites were correctly qualified; the function simply was not there.

All four local gates passed it, and `check-symbols.py` passed it for a reason it
documented about itself: it only resolved the LEADING segment of a dotted
expression, because that is the part a regex can resolve. `ReminderNotification`
existed, so `ReminderNotification.dismiss(...)` looked fine.

That was a real gap rather than an inherent one, so the checker now indexes the
members of every `object` declared in the package and verifies `Foo.bar` against
them. Brace-counted, not regex-matched — an object body is full of nested braces
from lambdas and apply blocks, and no regex closes correctly over them.

Verified by deleting `dismiss` from a copy of the tree again: it reports the
same two call sites the Kotlin compiler did. What it still cannot see is
narrowed and written down rather than left implied — members of anything
declared outside this package, members reached through a variable rather than a
type name, and every question about types.

ci-requirements.md

@@ -219,8 +219,12 @@ python3 android/tools/check-strings.py
 ```
 
 `check-symbols.py` flags any capitalised identifier that is neither imported,
-declared in the same package, a type parameter, nor implicitly available. Not a
-type checker — `compileDebugKotlin` in CI remains the only real one, and it is
+declared in the same package, a type parameter, nor implicitly available — and
+members of this package's own `object` declarations, so that `Foo.bar()` fails
+here when `Foo` has no `bar`. That second case exists because moving a function
+between two objects and forgetting to paste it into the second cost a red run
+(785ebdb): the call site was correctly qualified and every other gate passed.
+Not a type checker — `compileDebugKotlin` in CI remains the only real one, and it is
 also the ONLY lane that type-checks at all, since there is no Android SDK on the
 workstation.