Replace the lossy _entry_to_raw round-trip with a repos_cache threaded
alongside the ManifestBottle cache in _resolve_one_bottle. Each bottle's
effective git-gate.repos is stored as raw dicts keyed by name, so a child
field-merges directly against its parent's raw repos instead of
reconstructing them from parsed ManifestGitEntry objects.
_resolve_repos_raw now owns the union/clear/inherit semantics on plain
dicts; _merge_bottles just injects the precomputed merged set before
parsing. Drops _entry_to_raw entirely, removing the maintenance hazard
where a new ManifestGitEntry field would silently vanish from inherited
repos.
Addresses review feedback on #238.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NgEFTXcWZjA8n7ntq2zHQQ
didericis
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