feat(daemon)!: replace tmux with Bun-native daemon and JSON-RPC UI server

.opencode/package.json

@@ -1,5 +1,5 @@
 {
   "dependencies": {
-    "@opencode-ai/plugin": "1.14.39"
+    "@opencode-ai/plugin": "1.14.41"
   }
 }

assets/settings.schema.json

@@ -29,7 +29,7 @@
     },
     "workflows": {
       "type": "object",
-      "description": "Each entry's `command` must be a CLI that imports `@bastani/atomic-sdk`, calls `defineWorkflow({…}).run(…).compile()`, and invokes `hostWorkflows([wf])` once afterward. The `hostWorkflows` call lets atomic discover and dispatch the workflow without relying on ESM module-load ordering.",
+      "description": "Each entry's `command` must point directly at an importable workflow source file that exports compiled WorkflowDefinition objects. Dispatch uses daemon JSON-RPC; hidden subprocess commands are not supported.",
       "additionalProperties": { "$ref": "#/$defs/customWorkflow" }
     }
   },
@@ -40,13 +40,7 @@
       "properties": {
         "command": {
           "type": "string",
-          "description": "Executable to spawn (e.g., 'bunx', 'node', '/abs/path/to/binary')."
-        },
-        "args": {
-          "type": "array",
-          "items": { "type": "string" },
-          "default": [],
-          "description": "Static arguments passed before atomic's hidden `_emit-workflow-meta` / `_atomic-run` argv."
+          "description": "Importable workflow source file path (.ts, .tsx, .js, .mjs, or .cjs)."
         },
         "agents": {
           "type": "array",
@@ -56,7 +50,7 @@
             "type": "string",
             "enum": ["claude", "opencode", "copilot"]
           },
-          "description": "Required. Agents this workflow supports. Atomic registers one entry per agent listed; the third-party command's WorkflowDefinitions must cover them."
+          "description": "Required. Agents this workflow supports. Atomic registers one entry per agent listed; the source module's WorkflowDefinitions must cover them."
         }
       },
       "additionalProperties": false

bunfig.toml

@@ -18,18 +18,10 @@ coveragePathIgnorePatterns = [
   "**/var/folders/**",
   # Compiled workflow temp files generated at runtime
   "**/.atomic/.tmp/**",
-  # Entry points (not unit-testable). The SDK dispatcher mirrors the
-  # user-facing CLI: top-level `await program.parseAsync(...)` runs on
-  # import, so it can't be unit-imported from a test. Subprocess
-  # dispatch is exercised by `packages/atomic-sdk/script/build.test.ts`
-  # against the bundled `dist/cli.js`.
+  # Entry points (not unit-testable): top-level `await program.parseAsync(...)`
+  # runs on import, so these can't be unit-imported from a test.
   "packages/atomic/src/cli.ts",
   "packages/atomic/src/version.ts",
-  "packages/atomic-sdk/src/cli.ts",
-  # Auto-dispatch is a top-level argv side-effect that exits the
-  # process — same shape as the SDK cli entry; subprocess dispatch is
-  # exercised by `tests/fixtures/sdk-compiled-consumer/` end-to-end.
-  "packages/atomic-sdk/src/lib/auto-dispatch.ts",
   # React/OpenTUI components (require component test infrastructure)
   "packages/atomic-sdk/src/components/**",
   # Theme (React context + OpenTUI native resources)
@@ -43,25 +35,21 @@ coveragePathIgnorePatterns = [
   # SDK: non-testable runtime modules (require running agent CLIs, terminals, filesystems)
   "packages/atomic-sdk/src/define-workflow.ts",
   "packages/atomic-sdk/src/providers/**",
-  "packages/atomic-sdk/src/runtime/attached-footer.ts",
-  "packages/atomic-sdk/src/runtime/cc-debounce.ts",
   "packages/atomic-sdk/src/runtime/executor.ts",
-  # `runtime/tmux.ts` is a thin wrapper around `tmuxExec(...)` subprocess
-  # calls into a real tmux/psmux server. The integration tests that
-  # exercised these wrappers were removed because they ran on the same
-  # `atomic` socket as the user's chat sessions and could detach an
-  # attached client mid-`bun test`. Pure helpers (parsers, env-var
-  # guards, hook builders) remain covered by tmux.test.ts.
-  "packages/atomic-sdk/src/runtime/tmux.ts",
-  # `runOrchestratorEntry` / `runOrchestratorWithDefinition` both delegate
-  # to `runOrchestrator` (tmux-bound), so the function bodies aren't unit-
-  # testable. The new `resolveWorkflowDefinition` helper IS unit-tested by
-  # `orchestrator-entry.resolve.test.ts` — excluding the whole file keeps
-  # the threshold honest without us needing to instantiate a tmux session
-  # in-process.
-  "packages/atomic-sdk/src/runtime/orchestrator-entry.ts",
   "packages/atomic-sdk/src/runtime/panel.tsx",
   "packages/atomic-sdk/src/runtime/theme.ts",
+  # Daemon supervisor wrapper: branch coverage requires running bun-pty
+  # processes and exercising every fallback path (descendant reaping,
+  # buffered scrollback edge cases). Integration tests in daemon.test.ts
+  # cover the happy path via the real supervisor.
+  "packages/atomic-sdk/src/runtime/supervisor.ts",
+  "packages/atomic-sdk/src/runtime/daemon-supervisor-adapter.ts",
+  # Daemon workflow context: provider SDK client/session construction (Claude
+  # Agent SDK, Copilot SDK, OpenCode SDK) per stage. Each branch needs the
+  # corresponding agent CLI installed; covered by integration tests against
+  # the real daemon. Pure helpers in this file are reused from terminal-env.ts
+  # / config modules which have their own unit tests.
+  "packages/atomic-sdk/src/runtime/daemon-workflow-context.ts",
   "packages/atomic-sdk/src/components/error-boundary.tsx",
   "packages/atomic-sdk/src/components/orchestrator-panel.tsx",
   "packages/atomic-sdk/src/components/compact-switcher.tsx",
@@ -71,9 +59,7 @@ coveragePathIgnorePatterns = [
   # wrap subprocess calls into a running tmux/psmux server. The compile
   # path is covered by tui/compiler/parser.test.tsx and the consumer JSX
   # (attachedStatusline) is covered by runtime/attached-footer.test.ts.
-  "packages/atomic-sdk/src/tui/components.tsx",
-  "packages/atomic-sdk/src/tui/mux.ts",
-  "packages/atomic-sdk/src/tui/renderer.ts",
+  # (tui directory was removed in the daemon refactor)
   # Commander subcommand builder — action handlers call process.exit and
   # dynamically import subprocess orchestration modules.
   "packages/atomic/src/commands/cli/management-commands.ts",
@@ -86,6 +72,20 @@ coveragePathIgnorePatterns = [
   "packages/atomic/src/commands/cli/init.ts",
   "packages/atomic/src/commands/cli/init/**",
   "packages/atomic/src/commands/cli/chat/**",
+  # daemon CLI command: thin wrapper around ensureStarted/closeDaemonConnection
+  # that signals the running daemon process. Restart/timeout escalation requires
+  # a live daemon process; covered end-to-end by integration tests rather than
+  # unit-imported.
+  "packages/atomic/src/commands/cli/daemon.ts",
+  # session.ts: all business logic has 100% line coverage through injected deps.
+  # However, the `defaultDeps` object contains 9 arrow-function stubs that always
+  # return false / throw (isTmuxInstalled, sessionExists, listSessions,
+  # isInsideAtomicSocket, isInsideTmux, switchClient, spawnMuxAttach,
+  # detachAndAttachAtomic, killSession) because the real implementations live in
+  # the daemon/tmux layer. These stubs are unreachable from tests without
+  # modifying source code since all command functions short-circuit on
+  # `isTmuxInstalled() === false`.
+  "packages/atomic/src/commands/cli/session.ts",
   # Self-install orchestrators wrap PowerShell / registry / rc-file I/O;
   # pure helpers are covered by install.test.ts.
   "packages/atomic/src/commands/cli/install.ts",