chore(master): release 2.74.2

[github-actions]

🤖 I have created a release beep boop

2.74.2 (2026-07-26)

Bug Fixes

• api: bring /v1/changes under the route-table guardrail (d685ad8)
• auth: normalize the rate-limit window and reject a negative cost (4c58678)
• export: correct the concurrency limits and the active-set ownership (690934a)
• imap: keep an error sink on abandoned IMAP connections (a9ef9e3)
• imap: report account log write failures instead of crashing the worker (e881e65)
• imap: stop wiping the folder listing on an unusable LIST response (f6229bb)
• imap: tolerate a FETCH response that omits FLAGS (b78b314)
• smtp: handle MIME parse errors and enforce the message size limit (e70eb7d)
• smtp: reject an unparseable message permanently instead of with a 450 (ef77542)
• ui: flag recently restarted workers on the internals page (435a932)

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[github-actions]

🤖 Created releases:

• v2.74.2

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