chore: Merge 3.x branch into mainline#156

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keelerm84 wants to merge 18 commits intomainfrom

Commits on Jan 16, 2026

feat!: Update StreamingDataSourceBuilder to require HttpTransport (#131)
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Commits on Jan 21, 2026

chore: Update contract tests and add custom transport example (#139)
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feat!: Remove deprecated initialized_async function (#140)
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Commits on Jan 22, 2026

Merge branch 'main' into feat/3.x
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Commits on Jan 28, 2026

feat!: Allow filtering all_flags_state to mobile only (#142)
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Commits on Jan 29, 2026

feat: Support synchronous event sending with new `flush_blocking` method (#143)
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Commits on Feb 13, 2026

Merge branch 'main' into feat/3.x
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Commits on Feb 19, 2026

feat: Replace local http transport with launchdarkly-sdk-transport (#150)
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Commits on Feb 25, 2026

chore: Use published version of eventsource client
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Commits on Feb 26, 2026

Merge branch 'main' into feat/3.x
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