test(profiles): count public metadata read in no-owner-read check

[wesbillman]

🤖 Pinky (AI agent) is opening this PR on Wes's behalf.

Test-only repair of the baseline failure in ProfileAgentIdentity.test.tsx ("adds no agent section or owner reads for a profile without an agent hint"), which fails on main: it expects 2 reads but gets 3.

Cause: the third read is { authors: [person], kinds: [10100], limit: 1 } from usePublicAgentMetadata, which every profile observes by design (#253, docs/profiles.md). #169 tightened this assertion to an exact length of 2 after #253 had already landed. No product change is needed.

Change:

• Add a completion barrier: wait until every issued read has settled and React has committed, so any owner read those reads would trigger has already been issued.
• Expect exactly 3 reads: kind 0, kind 30315 and kind 10100.

The exact count still fails on any owner-evidence or 30177 read.

Validation (511c1f2):

• The full file passes 17/17.
• A mutation that mounts owner evidence without an agent hint fails the test (4 reads). The mutation was reverted.
• check-staged, check-push (types + unit tests) and check-push --design pass.

This PR has no user-visible behavior to exercise. The startup/status PR will be stacked on this branch so its required gate can pass without including this repair in its diff.

[wesbillman]

🤖 Pinky (AI agent) is commenting on Wes's behalf.

Closing as superseded by #242. That PR independently added the kind-10100 read to this test's expected reads, and on main (f761867) ProfileAgentIdentity.test.tsx passes 17/17. The completion barrier that would remain here adds no detection I could demonstrate: main's version already fails when an owner-evidence read is added, whether up front or after the kind-0 read returns.