doc: update for b/ batch namespace

- doc/help.md: add b/ to filesystem layout, remove s/{id}/reply
- README.md: update sub-agents and composability blurbs to reference b/

README.md

@@ -91,11 +91,11 @@ git submodule update --remote
 
 **Discoverability** — `ls s/{id}/` shows every control surface. `cat t/idx` and `cat sk/idx` list available tools and skills. `cat help` explains the rest.
 
-**Composability** — Agents can be composed by piping `reply` into another session's `prompt`. Tools can be composed via `execute_pipe`, chaining `execute_code` and `execute_tool` steps the same way Unix pipes chain programs.
+**Composability** — Tools can be composed via `execute_pipe`, chaining `execute_code` and `execute_tool` steps the same way Unix pipes chain programs. Sessions can be chained by reading `s/{id}/chat` and writing to another session's `prompt` or `enqueue`.
 
 **Passive memory** — Every session's chat history accumulates at `s/{id}/chat`, searchable with `grep`. An agent doesn't need to actively decide what to remember. This extends across sessions: an agent can search another session's chat for answers that have already been worked through.
 
-**Sub-agents** — An agent can spin up new sessions by writing to `s/new`, prime each one with a prompt, and collect results by reading their `reply` or having them write back to the parent's `prompt` or `enqueue`. Coordination is not yet fully resolved, but the basic fan-out pattern works today.
+**Sub-agents** — An agent can fan out work by writing to `b/new` (ephemeral one-shot jobs) or `s/new` (persistent sessions), then collect results from `b/{id}/result` or `s/{id}/chat`. Multiple jobs run concurrently with `parallel=N`; each gets its own result file.
 
 ## Credits
 

doc/help.md

@@ -24,6 +24,15 @@ ollie/
     idx           memory index (ro)          cat
   p/              prompt templates (ro)      ls, cat  (rebuilt on new session, /cwd, /agent)
   pl/             plans (r/w)                ls, cat, edit
+  b/              batch jobs (ephemeral)      ls
+    idx           job index (ro)             cat: id status cwd agent, one per line
+    new           create job (r/w)           cat: KV template; write spec to submit
+    <id>/         job directory              rm -r to cancel and remove
+      spec        original job spec (ro)
+      status      job status (ro)            running | done | failed: <reason>
+      result      assistant reply (ro)
+      usage       token counts (ro)
+      ctxsz       context size (ro)
   s/              sessions                   ls
     idx           session index (ro)         cat: id state cwd backend model, one per line
     new           create session (r/w)       cat: KV template; echo "cwd=/path" >
@@ -40,7 +49,6 @@ ollie/
       model       active model (r/w)
       models      available models (ro)
       prompt      submit prompt (w)
-      reply       last reply (ro)
       state       agent state (ro)           idle | thinking | calling: <tool>
       systemprompt rendered system prompt (ro)
       usage       token counts (ro)