docs(TASK-021): fix task-queue example IDs + document dispatch/collect/failure semantics

- prompts.rs DEFAULT_SPAWN_INSTRUCTIONS: example IDs task_1/task_2 -> "1"/"2"
  (real numeric-string IDs; old format silently produced dep_error + unblocked
  task), plus task-queue rules: root tasks with agent are never auto-dispatched,
  task_complete is what dispatches dependents, auto-dispatched agents must be
  collected, failed tasks permanently block dependents.
- architect config: optional task-queue mirroring guidance for parallel mode
  (disk task files stay the durable store; queue is in-memory).
- sisyphus config: short note on encoding dependency-shaped bursts as
  agent__task_create chains; todos remain the tracking source of truth.

assets/agents/architect/config.yaml

@@ -456,6 +456,20 @@ instructions: |
      the task (step 5), and clean up — `git worktree remove .worktrees/task-NNN` and delete the task
      branch (local + remote).
 
+  **Task-queue mirroring (optional).** For a parallel batch, the `agent__task_*` queue MAY mirror
+  the disk `blocked_by` graph — one queue task per TASK-NNN with `agent: sisyphus`, the delegation
+  prompt, and its variables — so completing a task auto-dispatches its unblocked dependents. This is
+  guidance, not a mandate; if you use it, these rules are HARD:
+  - Disk task files remain the durable store. The queue is in-memory and lost on
+    restart/compression — it is NEVER the source of truth.
+  - Root tasks (no blockers) are NOT auto-dispatched on create — spawn them yourself.
+  - Call `agent__task_complete` ONLY after this task's verification gate (adversary check, merge,
+    integration build+tests) passes — completing is what dispatches dependents.
+  - Collect every auto-dispatched agent via `agent__collect`; nothing is collected for you, and an
+    agent finishing does NOT complete its task.
+  - A failed spawn (capacity/whitelist) strands the queue task InProgress with no reset — recreate
+    the task rather than retrying it.
+
   Phase F is UNCHANGED (same single draft PR from the run branch). Before opening it, verify no
   stale worktrees or task branches remain (`git worktree list`); clean up any leftovers.
 

assets/agents/sisyphus/config.yaml

@@ -234,6 +234,11 @@ instructions: |
 
   Never artificially cap at a small number. If there are 10 distinct things to find, spawn 10 agents. The system limit is the only ceiling that matters.
 
+  For dependency-shaped bursts (explore → code → verify), `agent__task_create` chains MAY encode the
+  ordering — dependents with `agent`+`prompt` auto-dispatch when `agent__task_complete` unblocks them.
+  Same rules as direct spawning: collect every auto-dispatched agent via `agent__collect`, and an agent
+  finishing does NOT complete its task — call `agent__task_complete` yourself. Todos remain the tracking source of truth.
+
   If the slices are likely to FEED each other (adjacent modules; one lane's discovery redirects another's search), run the burst in team mode per `parallel-research`: after spawning, send
   every explorer the roster of its siblings (`agent__send_message --id <id> --message "Teammate roster: <slice>=<id>, ... Message a teammate directly when you find a fact in THEIR slice;
   check your inbox after each search round and before finalizing."`) so cross-slice facts move directly between lanes instead of waiting for your synthesis. Never do this with reviewer

src/config/prompts.rs

@@ -167,17 +167,26 @@ pub(in crate::config) const DEFAULT_SPAWN_INSTRUCTIONS: &str = indoc! {"
     ```
     # Create tasks with dependencies (optional: auto-dispatch with --agent)
     agent__task_create --subject \"Explore existing patterns\"
-    agent__task_create --subject \"Implement feature\" --blocked_by [\"task_1\"] --agent coder --prompt \"Implement based on patterns found\"
+    agent__task_create --subject \"Implement feature\" --blocked_by [\"1\"] --agent coder --prompt \"Implement based on patterns found\"
-    agent__task_create --subject \"Write tests\" --blocked_by [\"task_2\"]
+    agent__task_create --subject \"Write tests\" --blocked_by [\"2\"]
 
     # Check what's runnable
     agent__task_list
 
     # After completing a task, mark it done to unblock dependents
     # If dependents have --agent set, they auto-dispatch
-    agent__task_complete --task_id task_1
+    agent__task_complete --task_id 1
     ```
 
+    Task-queue rules (NOT obvious — read carefully):
+    - Task IDs are numeric strings (\"1\", \"2\", ...) assigned in creation order.
+    - A task created with `agent` but NO blockers is NEVER auto-dispatched — spawn it yourself.
+    - Auto-dispatch happens only inside `agent__task_complete`: completing a task is what
+      dispatches its newly-unblocked dependents.
+    - Auto-dispatched agents must still be collected via `agent__collect`, and an agent finishing
+      does NOT complete its task — call `agent__task_complete` yourself to advance the chain.
+    - A failed task permanently blocks its dependents — recreate the chain rather than retrying.
+
     ### Escalation Handling
 
     Child agents may need user input but cannot prompt the user directly. When this happens,