Cross-agent handoffs need to know two things the old schema did not
carry: where the project lives on disk (so the receiving agent opens
the right repo), and which agent wrote the checkpoint (so branches
can be attributed when two agents have forked the same tree). Round 1
of the dogfood lost the first one — Agent A designed files at one
path and Agent B wrote them at a different path because nothing in
the schema carried "where we are". Round 2 worked around it by putting
the path in the prompt, but the schema still had no slot for it.
This build adds a `project_root` column to the commits table (nullable
TEXT, no backfill), plumbs it through the V2 commit-create path and
V4 chat-commit path, and has `smriti checkpoint create` auto-capture
the current working directory by default. `--project-root /path`
overrides and `--no-project-root` opts out.
`author_agent` already existed on the model but the V4 chat-commit
endpoint hardcoded it to the session's active provider (e.g.
"anthropic"), so it was a provider name, not an agent identifier.
This build makes the request's `author_agent` field win when provided
and falls back to the session provider only when it isn't. CLI adds
`--author-agent <name>` so agents can tag themselves cleanly as
"claude-code" or "codex-local" rather than the underlying provider.
Both fields surface in `smriti state`, `smriti checkpoint show`, and
`smriti restore` meta lines — `by <agent>` and `at <path>` (with $HOME
tilde-expanded for readability). The meta line elides each segment
cleanly when the field is null, so old checkpoints without either
value still render correctly.
While I was here, flipped `smriti state` to show full artifacts by
default. `--preview` is the new way to get truncated previews.
`--full-artifacts` is kept as a no-op alias so existing scripts that
explicitly passed it still work. The CLI is agent-first and agents
want the full content for handoff; humans wanting a quick glance can
pass `--preview`.
149/149 backend tests pass (147 pre-existing + 2 new: round-trip of
the two fields and the author_agent fallback regression).
