Paired molecule-core change for the molecule-cli `molecule connect`
RFC (https://github.com/Molecule-AI/molecule-cli/issues/10).
After this PR an `external`-runtime workspace's full lifecycle
matches the operator-driven model: it boots in awaiting_agent, the
CLI connects in poll mode without operator-side flag tuning, the
heartbeat-loss path lands back on awaiting_agent (re-registrable)
instead of the terminal-feeling 'offline'.
Two changes in workspace-server:
1) `resolveDeliveryMode` (registry.go) now reads `runtime` alongside
`delivery_mode`. Resolution order:
a. payload.delivery_mode if non-empty (operator override)
b. row's existing delivery_mode if non-empty (preserves prior
registration)
c. **NEW:** "poll" if row.runtime = "external" — external
operators run on laptops without public HTTPS; push-mode
would hard-fail at validateAgentURL anyway. (`molecule connect`
registers without --mode and expects this default.)
d. "push" otherwise (historical default for platform-managed
runtimes — langgraph, hermes, claude-code, etc.)
2) Heartbeat-loss for external workspaces lands them in
`awaiting_agent` instead of `offline`. Two code paths:
- `liveness.go` — Redis TTL expiration. Uses a CASE expression
so the conditional is one UPDATE (no extra round-trip for
non-external runtimes, no TOCTOU between runtime read and
status write).
- `healthsweep.go::sweepStaleRemoteWorkspaces` — DB-side
last_heartbeat_at age scan. This sweep is already external-
only by query filter, so the UPDATE just hard-codes the new
status.
The Docker-side `sweepOnlineWorkspaces` keeps `offline` —
recovery there is "restart the container", not "re-register from
the operator's box".
Why awaiting_agent over offline for external:
- Matches the status the workspace was created in (workspace.go:333).
- The CLI re-registers on every invocation; awaiting_agent → online
is the natural transition. offline is a terminal-feeling status
that implies operator intervention is needed.
- An operator who closed their laptop overnight should see
awaiting_agent in canvas, not 'offline (something is wrong)'.
Test plan:
- Existing: 9 `resolveDeliveryMode` test sites updated to the new
query shape. Sqlmock now reads `delivery_mode, runtime` columns.
- New: TestRegister_ExternalRuntime_DefaultsToPoll asserts the
external→poll branch. TestRegister_NonExternalRuntime_StillDefaultsToPush
guards against the new branch overshooting (langgraph keeps push).
- Liveness: regex updated to match the CASE expression.
- Healthsweep: `TestSweepStaleRemoteWorkspaces_MarksStaleAwaitingAgent`
(renamed for grep-ability), Docker-side sweepOnlineWorkspaces test
unchanged (verified to still match `'offline'`).
- Full handlers + registry suite green under -race (12.873s + 2.264s).
No migration needed — `status` is a free-form text column; both
'offline' and 'awaiting_agent' are existing values used elsewhere
(workspace.go uses awaiting_agent on initial external creation).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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