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docs(guide): the cross-shard fast path defaults to auto, not off - #1016

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docs/production-guide.md contradicts itself about --cross-shard-fast-path. The table and src/config.rs:476 (default_value = "auto") say the default is auto. Two prose passages still say "The default is off": they predate #777, which flipped the default. This is the residual that the #776 triage found after its main defect was fixed.

Changes (docs only):

Checked: no other passage in docs/ or README.md claims a default for this flag.

Refs #776 (already closed on its main defect).

docs/production-guide.md contradicted itself about --cross-shard-fast-path.
Its table and src/config.rs (`default_value = "auto"`) give the default as
`auto`, but two prose passages still said "The default is `off`". Those
passages were written before moon#777 flipped the default, and nobody updated
them afterwards. A reader following the prose would think they are on the
SPSC path when they are not.

- "The default is `off`" now says `auto`, and names `off` as the rollback.
- The moon#768 table is relabelled as the measurement that held the
  default at `off` before moon#777, with the half-populated-keyspace
  caveat from the section above.
- The "Future" section says the shared-nothing plan (last revised May
  2026) predates moon#777, so its "delete the fast path in Phase 3" is a
  proposal, not a scheduled change.

This resolves the residual left open when moon#776's main defect (the flag
refusing startup) was fixed by #777.

Refs #776

author: Tin Dang
@TinDang97 TinDang97 added the skip-changelog Skip the CHANGELOG.md update gate for this PR label Sep 18, 2026
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