feat(mcp-server)!: remove the repl tool and the repl-engine package

[VikashLoomba]

What

Removes the interactive repl MCP tool and everything that existed only to serve it. The MCP server's model-facing surface is now the workflow tool plus the capability-gated workflow_monitor view (and the app-only workflow-events / workflow-runs / workflow-notifications tools).

• packages/repl-engine is deleted (≈18k lines of source, ≈13k of tests). Only mcp-server imported it; workflows declared it solely because its bundled MCP entry externalizes @automatalabs/*. quickjs-wasi drops out of the lockfile. The workspace is nine packages.
• mcp-server: the six REPL-only modules (repl-tool, repl-project, repl-presence, repl-stdio-transport, repl-stdio-relay-worker, wasm-ambient.d.ts) are deleted, and the REPL is cut out of the shared files.

Scope decision

Kept by decision: the acp-agents / pi-acp / codex-acp SDK and wire surfaces whose only in-repo consumer was the REPL broker — InteractiveSession.awaitCurrentTurn() and the loaded-turn errors, the _session/loaded_turn extension, the turn-text passthroughs, onHandoff, InteractiveSession.steer, runner.defaultBackendId(). They are unchanged and remain supported; only comments and README passages that credited them to "the REPL broker" were reworded to describe the host re-attach surface.

Contract changes (@automatalabs/mcp-server, major)

• repl is no longer registered; SERVER_INSTRUCTIONS describes workflow only.
• Removed exports: replToolInputShape, replToolOutputShape, ReplToolOptions, createReplProjectState, ensureReplWorkspace, disposeReplProjectState, resetReplProjectState, renameAsideNeverOverwriting, ReplProjectState, ReplPresenceLedger.
• CreateWorkflowServerOptions: drops replRunner, replPresence, replEvalBreakChannel, replDrainBoundMs, disconnectReplClientOnClose. replClientId → clientId: it had one non-REPL job — scoping workflow_monitor notification claims per legacy-era MCP client — so that capability is kept under an honest name (the daemon still passes each session's id).
• WorkflowServerControl: drops replBreakUrl() (was required), replDefaultProjectDir(), disposeReplEvalBreakChannel(). The stdio entry had been using the last of those as its general shutdown hook (event-subscription detach + permission-broker dispose); that is now a generic optional dispose().
• The in-process stdio entry serves over the SDK's StdioServerTransport. The worker-thread relay transport existed only to break a synchronous eval out of band; it and the shim's tools/call interception are gone.
• Daemon: the client-presence ledger and drain are removed with everything that fed them — CreateDaemonOptions.replRunner / replDrainBoundMs / sessionTtlMs / evalBreakChannel, DaemonHandle.activeReplDrainCount(), WorkflowProjectRegistry.disposeReplStates(), ProjectContext.repl, DaemonInfo.replBreakUrl, the SessionRegistry presence hooks and evictDrainable's keep veto (their sole consumer was the ledger). Idleness is sessions, runs and in-flight requests.
• Env knobs removed: AGENTPRISM_REPL_EVAL_TIMEOUT_MS, AGENTPRISM_REPL_DRAIN_BOUND_MS.
• Existing per-project repl/ stores on disk are left untouched and no longer read. No compatibility layer.

@automatalabs/workflows is also a major: its bundled mcp subcommand no longer serves repl and the repl-engine dependency is dropped. The programmatic SDK is unchanged.

Tests (deletions and rewrites named, per AGENTS.md)

• Deleted: the seven REPL-only mcp-server test files; the http-daemon presence-drain test; the live "REPL queue smoke"; the daemon-lifecycle "drain in flight" test.
• Rewritten, coverage kept:
  • Two shim recovery e2e tests used a never-ending repl eval as their accepted-but-unanswered request. They now start a live workflow config probe and freeze the daemon mid-probe (SIGSTOP) before killing it. (A request that never reached the daemon is a different case — the legacy path deliberately replays it — which is why a plainly frozen daemon was not a valid substitute.)
  • The live "invalid modes fail before execution" assertion moves from a repl eval to the workflow tool, which is stricter: it refuses at preparation, creating no run.
  • The idle-clock-restart test uses an active run instead of a drain; the session-registry test drops the veto case.
  • Tool-inventory assertions drop "repl"; the documented package count moves from ten to nine.

Docs

README, AGENTS.md, CONTRIBUTING.md, docs/api.md (three REPL sections removed) and the mcp-server / workflows READMEs drop the REPL. docs/roadmap/repl-orchestrator.md and repl-eval-redesign.md move to docs/archive/roadmap/ (design records of a removed feature); the one live cross-reference is updated. docs/authoring/ and the generated skills bundle had no REPL content and are unchanged.

Verification

pnpm build, pnpm typecheck, all nine package suites (2,246 tests, 0 failures), check-acp-deps, check-workflows-bundle-deps, attribution gate, changeset status, and the pre-push live (Claude / OpenCode / pi) + UI gates pass. One pnpm test run tripped workflow-engine's timing-bound journal test (3.5s against its bound) while the machine load average was ~26; it passes in 0.6s alone and on re-run, and this branch does not touch workflow-engine.

Follow-up outside this repo

@automatalabs/repl-engine@0.4.39 stays on npm. It should be marked deprecated there (npm deprecate), which needs publish rights and is not something CI does.