chore: Backport march (03/03/2026)#1263

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britaniar wants to merge 10 commits intoAzure:mainfrom

britaniar:backportMarch

Commits on Feb 23, 2026

fix: fix flaky enveloped e2e (#455)
britaniar
authored

Commits on Feb 24, 2026

feat: Lint helm (#458)
ryanzhang-oss
authored

Commits on Feb 25, 2026

Commits on Feb 26, 2026

feat: add namespace affinity scheduler plugin (not wired yet) (#463)
weng271190436
authored

Commits on Feb 27, 2026

feat: refactor hub agent flag handling logic + add per-flag validation logic (#459)
michaelawyu
authored

Commits on Mar 3, 2026