Agents may declare git.user (name/email); it overlays the referenced
bottle's git.user per-field at Manifest.bottle_for (agent wins on
non-empty), mirroring the extends: merge. git.remotes is rejected on
agents — it carries credentials and host trust and stays bottle-only.
The overlay lives at bottle_for, the single chokepoint both backends
use, so the docker/smolmachines git provisioners are unchanged. Adds
Manifest.git_identity_summary with per-field (agent)/(bottle)
provenance, printed in both preflights and `info`.
Refs #94
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
didericis
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