Survive broken pipes, add loom transcripts, attribute child cast results

.gitignore

@@ -25,3 +25,11 @@ Mnesia.*/
 *~
 erl_crash.dump
 scratch/
+
+# fleet process artifacts, never committed (tracked in the fleet ledger instead)
+/REPORT.md
+/REPORT-*.md
+/VERDICT.md
+/VERDICT-*.md
+/.tickets/
+/FRESHREAD*.md

REPORT.md

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+# dee-intr report
+
+## Summary
+
+Implemented interrupt, steer, queued sends, hard stop, and ACP cancel wiring for persistent Familiar entities.
+
+- `Cantrip.interrupt/2` requests cancellation of the active episode at the next turn boundary and records loom events.
+- `Cantrip.steer/2` injects a user message at the next boundary without ending the episode; it records control events and an intent.
+- `Cantrip.send/3` now queues mid-turn sends and replies to each caller when its queued episode completes.
+- `Cantrip.hard_stop/2` replies to active/queued callers, records `:hard_stopped`, kills the runner, and flushes/closes the loom.
+- ACP `session/cancel` now calls runtime cancellation; Familiar maps interrupted prompts to `PromptResponse.stop_reason == :cancelled`.
+- ACP prompt preparation stores a first-prompt entity pid before the blocking prompt call so first-turn cancel can reach the entity while preserving prompt trace ids.
+
+## Reproduce commands
+
+```bash
+git checkout feat/interrupt-steer
+mix test test/interrupt_steer_test.exs test/summon_test.exs test/acp_agent_test.exs
+mix test test/familiar_behavior_test.exs
+mix test
+```
+
+Evidence from this workspace:
+
+```text
+mix test test/interrupt_steer_test.exs test/summon_test.exs test/acp_agent_test.exs
+28 tests, 0 failures
+
+mix test test/familiar_behavior_test.exs
+21 tests, 0 failures
+
+mix test
+3 properties, 664 tests, 0 failures
+```
+
+Note: in this managed sandbox, `mix test` needed escalation because Mix PubSub attempted a local TCP socket and the sandbox returned `:eperm`.
+
+## Uncertainty
+
+Interrupt is a safe-boundary cancel. It does not abort an in-flight provider call mid-request; the request is observed at the next runtime boundary, then the loom records the interruption and the active episode returns cancelled/interrupted.
+
+## Filed tickets
+
+None.