Upstream commit: 18f4e9505027d790fd7e9fdad7f922be6719101d
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 118 in 50 files
Dangling module declarations removed: 5
Edits turning enterprise off: 25
Third-party code: 14 files, 0 not in THIRD-PARTY.md
Renamed identifiers: 67 in 19 files
Verification: clean
The same Enterprise footprint as v0.16.25. The build check is clean
apart from the expected errors in the rebuilt-feature tests. Adds
sd_notify readiness, an x86-64-v2 baseline for glibc x86_64 builds
with a startup CPU check, and hickory from upstream's patched branch.
Fixes RocksDB blob GC rewriting every blob on compaction, a milter
stall with SMFIP_NOHDRS, OIDC's email-claim fallback, Mailbox/set
moves and case-only renames, EmailSubmission onSuccess* naming an
existing submission, and VacationResponse/set enabling an empty script.