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MR-794 step 2: docs — runs/invariants/architecture/execution + cleanup

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Refresh user-facing and agent-facing docs for the staged-write rewire
and clean up stale Run-state-machine references that survived MR-771.

MR-794-specific updates:
* docs/runs.md — remove "Known limitation: mid-query partial failure"
  section; document the in-memory accumulator + D₂ rule + the
  LoadMode::Overwrite residual.
* docs/invariants.md §VI.25 — flip from aspirational/open to
  upheld for inserts/updates. Within-query read-your-writes is now
  load-bearing for the publisher CAS contract.
* docs/architecture.md — add "Mutation atomicity — in-memory
  accumulator (MR-794)" subsection with per-op flow; refresh the
  engine + state diagrams to drop RunRegistry and add MutationStaging.
* docs/execution.md — rewrite the mutation flow sequence diagram
  for the staged-write path; updated the LoadMode table to call
  out per-mode commit semantics; rewrote load vs ingest.
* docs/query-language.md — document the D₂ parse-time rule.
* docs/errors.md — add the D₂ BadRequest rejection path.
* docs/testing.md — extend the runs.rs row to cover the new MR-794
  contract tests; add the staged_writes.rs row.
* docs/releases/v0.4.1.md (new) — release note covering the rewire,
  test additions, residuals, and files changed.
* AGENTS.md (CLAUDE.md symlink) — update the atomic-per-query
  description and the L2 capability matrix row.

Stale-reference cleanup (MR-771 leftovers):
* docs/storage.md — drop live _graph_runs.lance / _graph_run_actors.lance
  from the layout diagram and prose; mark legacy.
* docs/branches-commits.md — move __run__<id> to a legacy note;
  remove publish_run from the publish-trigger list.
* docs/audit.md — refresh _as API list (drop begin_run_as / publish_run_as);
  legacy RunRecord.actor_id moved to a historical note.
* docs/constants.md — mark run registry / branch-prefix rows as legacy.
* docs/cli.md — replace the legacy omnigraph run * quickstart block
  with omnigraph commit list/show.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Ragnor Comerford 2026-05-01 10:43:19 +02:00
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docs/query-language.md
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@ -64,6 +64,14 @@ Used inside MATCH or as expressions inside RETURN/ORDER:
`<value>` is a literal, `$param`, or `now()`. Multi-statement mutations execute atomically (added in v0.2.0).
### D₂ — mixed insert/update + delete is rejected at parse time
A single mutation query must be **either insert/update-only or delete-only**. Mixed → rejected before any I/O with the message:
> `mutation '<name>' on the same query mixes inserts/updates and deletes; split into separate mutations: (1) inserts and updates, then (2) deletes. This restriction lifts when Lance exposes a two-phase delete API (tracked: MR-793 / Lance-upstream).`
Reason: under the staged-write rewire (MR-794), inserts and updates accumulate in memory and commit at end-of-query, while deletes still inline-commit (Lance 4.0.0 has no public two-phase delete). Mixing creates ordering hazards (same-row insert→delete becomes a no-op because the staged insert isn't visible to delete; cascading deletes of just-inserted edges break referential integrity by silent design). Until Lance exposes `DeleteJob::execute_uncommitted`, the parse-time rejection keeps both paths atomic and correct. See [docs/runs.md](runs.md) and [docs/invariants.md §VI.25](invariants.md).
## IR (Intermediate Representation)
`QueryIR { name, params, pipeline: Vec<IROp>, return_exprs, order_by, limit }`