Manifest.resolve() now returns an empty-dict manifest with only directory
paths recorded (home_md, cwd_md). No content is read from any .md file
until load_for_agent() is called for a specific agent at preflight.
- Manifest.from_md_dirs: scan-only, no frontmatter parsing
- Manifest.load_for_agent: parses the selected agent file and its bottle
chain; works on eager (from_json_obj) manifests too by returning self
- Manifest.all_agent_names: scans filenames in lazy mode
- backend._validate: calls load_for_agent and propagates upgraded spec
- cli/info.py, cli/list.py, cli/start.py: use load_for_agent / all_agent_names
- manifest_extends.py: reverted to original (no partial-resolve helpers)
- manifest_loader.py: only scan_agent_names + load_bottle_chain_from_dir
- Tests updated to call load_for_agent before accessing agents/bottles;
test_md_agent_repos_deferred renamed to test_md_agent_repos_fails_at_preflight
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>