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.

android/tools/check-symbols.py

@@ -12,6 +12,16 @@ one; this is a cheap pre-push filter for the single mistake that survives every
 other local gate. It errs toward false positives — anything it cannot account
 for is reported rather than assumed fine.
 
+It also checks MEMBERS of this package's own `object` declarations — `Foo.bar()`
+where `Foo` is an object declared here. That case was added after moving a
+function between two objects and forgetting to paste it into the second: the
+call site read `Other.thing()`, resolved fine as far as the leading token, and
+failed in CI (785ebdb).
+
+Still NOT caught, so a clean run is not over-read: members of anything declared
+outside this package, members reached through a variable rather than a type
+name, and every question about types. Those are what `compileDebugKotlin` is for.
+
     python3 android/tools/check-symbols.py [source-root]
 
 Exits non-zero when something is unaccounted for.
@@ -69,6 +79,44 @@ def strip(src: str) -> str:
     return src
 
 
+def object_members(src: str) -> dict:
+    """Map each `object Foo` declared here to the names declared directly in it.
+
+    Brace-counted rather than regex-matched: an object body contains nested
+    braces (lambdas, apply blocks, companions) and no regex closes correctly over
+    them. Only top-level members count — anything nested deeper is not reachable
+    as `Foo.member` anyway.
+    """
+    members = {}
+    for match in re.finditer(r"^(?:internal |private )?object (\w+)\s*\{", src, re.M):
+        name = match.group(1)
+        depth = 0
+        body_start = match.end() - 1
+        for i in range(body_start, len(src)):
+            if src[i] == "{":
+                depth += 1
+            elif src[i] == "}":
+                depth -= 1
+                if depth == 0:
+                    break
+        body = src[body_start + 1 : i]
+        own = set()
+        depth = 0
+        for line in body.splitlines():
+            if depth == 0:
+                decl = re.match(
+                    r"\s*(?:@\w+\s+)*(?:public |private |internal |protected )?"
+                    r"(?:const |lateinit |inline |suspend )*(?:fun|val|var)\s+"
+                    r"(?:<[^>]*>\s*)?(\w+)",
+                    line,
+                )
+                if decl:
+                    own.add(decl.group(1))
+            depth += line.count("{") - line.count("}")
+        members[name] = own
+    return members
+
+
 def main() -> int:
     root = sys.argv[1] if len(sys.argv) > 1 else DEFAULT_ROOT
     files = [
@@ -79,6 +127,7 @@ def main() -> int:
     ]
 
     declared = collections.defaultdict(set)
+    objects = {}
     parsed = {}
     for path in files:
         with open(path, encoding="utf-8") as fh:
@@ -86,6 +135,7 @@ def main() -> int:
         package = re.search(r"^package\s+([\w.]+)", raw, re.M).group(1)
         src = strip(raw)
         parsed[path] = (package, src, raw)
+        objects.update(object_members(src))
         for match in DECL.finditer(src):
             declared[package].add(match.group(1))
         # Enum entries are declarations too; DECL only sees the class itself.
@@ -119,6 +169,18 @@ def main() -> int:
             print(f"{os.path.relpath(path, root)}:{line}: unresolved '{name}'")
             problems += 1
 
+        # Members of objects declared in this package.
+        for match in re.finditer(r"(?<![\w.])([A-Z][A-Za-z0-9_]*)\.(\w+)", src):
+            owner, member = match.group(1), match.group(2)
+            if owner not in objects or member in objects[owner]:
+                continue
+            line = src[: match.start()].count("\n") + 1
+            print(
+                f"{os.path.relpath(path, root)}:{line}: "
+                f"'{owner}' has no member '{member}'"
+            )
+            problems += 1
+
     print(f"\n{len(files)} files, {problems} unresolved")
     return 1 if problems else 0