refactor: Address reviewer feedback

- Remove all hasattr(transport, 'loop') checks in client.py — redundant
  since AsyncHttpTransport.__init__ always sets self.loop
- Remove irrelevant lore entries from AGENTS.md (Consola, Zod, remark-lint)
- Remove duplicate and implementation-detail tests per reviewer:
  - asyncio tests: keep only e2e tests (test_internal_tasks_not_wrapped,
    test_loop_close_patching, test_loop_close_flushes_async_transport)
  - client tests: remove _close_components/_flush_components detail tests
  - transport tests: remove all sync-wrapper and mock-based coverage tests
    that were not reviewable
- Remove section separator comments from test files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: BYK

AGENTS.md

@@ -69,16 +69,4 @@ Do NOT edit these directly — modify source scripts instead:
 | `scripts/populate_tox/config.py` | Test suite configuration |
 
 <!-- This section is maintained by the coding agent via lore (https://github.com/BYK/opencode-lore) -->
-## Long-term Knowledge
-
-### Gotcha
-
-<!-- lore:019cc484-f0e1-7016-a851-177fb9ad2cc4 -->
-* **AGENTS.md must be excluded from markdown linters**: AGENTS.md is auto-managed by lore and uses \`\*\` list markers and long lines that violate typical remark-lint rules (unordered-list-marker-style, maximum-line-length). When a project uses remark with \`--frail\` (warnings become errors), AGENTS.md will fail CI. Fix: add \`AGENTS.md\` to \`.remarkignore\`. This applies to any lore-managed project with markdown linting.
-
-<!-- lore:019cc40e-e56e-71e9-bc5d-545f97df732b -->
-* **Consola prompt cancel returns truthy Symbol, not false**: When a user cancels a \`consola\` / \`@clack/prompts\` confirmation prompt (Ctrl+C), the return value is \`Symbol(clack:cancel)\`, not \`false\`. Since Symbols are truthy in JavaScript, checking \`!confirmed\` will be \`false\` and the code falls through as if the user confirmed. Fix: use \`confirmed !== true\` (strict equality) instead of \`!confirmed\` to correctly handle cancel, false, and any other non-true values.
-
-<!-- lore:019cc303-e397-75b9-9762-6f6ad108f50a -->
-* **Zod z.coerce.number() converts null to 0 silently**: Zod gotchas in this codebase: (1) \`z.coerce.number()\` passes input through \`Number()\`, so \`null\` silently becomes \`0\`. Be aware if \`null\` vs \`0\` distinction matters. (2) Zod v4 \`.default({})\` short-circuits — it returns the default value without parsing through inner schema defaults. So \`.object({ enabled: z.boolean().default(true) }).default({})\` returns \`{}\`, not \`{ enabled: true }\`. Fix: provide fully-populated default objects. This affected nested config sections in src/config.ts during the v3→v4 upgrade.
 <!-- End lore-managed section -->

sentry_sdk/client.py

@@ -1037,9 +1037,7 @@ def close(
         semantics as :py:meth:`Client.flush`.
         """
         if self.transport is not None:
-            if isinstance(self.transport, AsyncHttpTransport) and hasattr(
-                self.transport, "loop"
-            ):
+            if isinstance(self.transport, AsyncHttpTransport):
                 logger.warning(
                     "close() used with AsyncHttpTransport. "
                     "Prefer close_async() for graceful async shutdown. "
@@ -1062,10 +1060,7 @@ async def close_async(
         semantics as :py:meth:`Client.flush_async`.
         """
         if self.transport is not None:
-            if not (
-                isinstance(self.transport, AsyncHttpTransport)
-                and hasattr(self.transport, "loop")
-            ):
+            if not isinstance(self.transport, AsyncHttpTransport):
                 logger.debug(
                     "close_async() used with non-async transport, aborting. Please use close() instead."
                 )
@@ -1090,9 +1085,7 @@ def flush(
         :param callback: Is invoked with the number of pending events and the configured timeout.
         """
         if self.transport is not None:
-            if isinstance(self.transport, AsyncHttpTransport) and hasattr(
-                self.transport, "loop"
-            ):
+            if isinstance(self.transport, AsyncHttpTransport):
                 logger.warning(
                     "flush() used with AsyncHttpTransport. Please use flush_async() instead."
                 )
@@ -1116,10 +1109,7 @@ async def flush_async(
         :param callback: Is invoked with the number of pending events and the configured timeout.
         """
         if self.transport is not None:
-            if not (
-                isinstance(self.transport, AsyncHttpTransport)
-                and hasattr(self.transport, "loop")
-            ):
+            if not isinstance(self.transport, AsyncHttpTransport):
                 logger.debug(
                     "flush_async() used with non-async transport, aborting. Please use flush() instead."
                 )