Document Customer.io SDK timeout and reload recovery

[benceruleanlu]

Behavior

Document the SDK lifecycle introduced by the parent PR: retry settings-fetch failures on activation/online events, retain one SDK after construction, require document reload after unexpected partial initialization failure, and keep operations serialized after a caller's 10-second wait expires.

These details distinguish immediate display revocation from the time an unfinished SDK operation takes to settle. No product or test code changes.

Validation

Checked the documentation against the controller and adapter implementation. The parent passed 16 focused unit tests and both real-SDK Electron rendering fixtures. The combined stack also passed both native-view handoff cases. Required pre-commit checks passed.

Change breakdown

Changed lines = additions + deletions. No merge-only changes.

Category	Files	Added	Deleted	Share of changed lines
Documentation	1	9	2	100.0%
Product code	0	0	0	0.0%
Test code	0	0	0	0.0%
Total	1	9	2	100%

Documentation paths

• docs/customerio-messaging.md

No generated or vendored files changed.

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