direct: leave state closed when Open fails

[denik]

Open assigns db.Path before every fallible step, so a failed open left the receiver half-initialized: the next Open on the same value panicked with "state already opened" instead of reporting the real error.

Move the body into unlockedOpen and reset the receiver when it fails. Finalize reuses the same reset helper.

[eng-dev-ecosystem-bot]

Integration test report

Commit: e66c0b2

Run: 32352085072

	Env	🔄​flaky	💚​RECOVERED	🙈​SKIP	✅​pass	🙈​skip	Time
💚​	aws linux		1	4	274	1162	5:54
💚​	aws windows		1	4	276	1160	3:14
💚​	azure linux		1	4	273	1162	7:18
💚​	azure windows		1	4	275	1160	4:30
💚​	gcp linux		1	4	274	1162	5:47
🔄​	gcp windows	8	1	4	268	1160	4:54

13 interesting tests: 8 flaky, 4 SKIP, 1 RECOVERED

	Test Name	aws linux	aws windows	azure linux	azure windows	gcp linux	gcp windows
💚​	TestAccept	💚​R	💚​R	💚​R	💚​R	💚​R	💚​R
🙈​	TestAccept/bundle/invariant/no_drift	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S
🙈​	TestAccept/bundle/resources/vector_search_endpoints/drift/recreated_same_name	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S
🙈​	TestAccept/bundle/resources/vector_search_indexes/recreate/embedding_dimension	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S
🙈​	TestAccept/ssh/connection	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S	🙈​S
🔄​	TestFsCpFileToFileWithOverwriteFlag	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
🔄​	TestFsCpFileToFileWithOverwriteFlag/local_to_uc-volumes	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
🔄​	TestFsMkdirWhenDirectoryAlreadyExists	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
🔄​	TestFsMkdirWhenDirectoryAlreadyExists/uc-volumes	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
🔄​	TestFsMkdirWhenFileExistsAtPath	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
🔄​	TestFsMkdirWhenFileExistsAtPath/uc-volumes	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
🔄​	TestFilerRecursiveDelete	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f
🔄​	TestFilerRecursiveDelete/files	✅​p	✅​p	✅​p	✅​p	✅​p	🔄​f

Top 6 slowest tests (at least 2 minutes):

duration	env	testname
4:20	azure windows	TestAccept
3:53	aws linux	TestAccept
3:50	gcp linux	TestAccept
3:48	azure linux	TestAccept
3:10	gcp windows	TestAccept
3:06	aws windows	TestAccept