feat: improve task execution, verification and packaging

Add execution incidents, action bursts and shared Flash history.

Expose verification and Explorer settings with streamed check results.

Support graceful cancellation, recording recovery and bundled UI resources.

Add CI quality checks and clean up comments and documentation.

tests/unit/memory/test_transcript_ledger.py

@@ -85,9 +85,7 @@ def _fingerprint(msg) -> str:
 
 
 def _has_image(msg) -> bool:
-    return any(
-        isinstance(b, dict) and b.get("type") in ("image_url", "image") for b in msg.content
-    )
+    return any(isinstance(b, dict) and b.get("type") in ("image_url", "image") for b in msg.content)
 
 
 def test_format_session_offset():
@@ -139,8 +137,7 @@ def test_validator_result_message_carries_session_offset():
     result_messages = [
         m
         for m in ledger.active_messages
-        if isinstance(m, HumanMessage)
-        and str(m.content).find(EXECUTION_RESULT_MARKER) >= 0
+        if isinstance(m, HumanMessage) and str(m.content).find(EXECUTION_RESULT_MARKER) >= 0
     ]
     assert len(result_messages) == 1
     text = result_messages[0].content[0]["text"]
@@ -153,9 +150,7 @@ def test_validator_result_skipped_for_actionless_turn():
     ledger = TranscriptLedger(step_memory=_service())
     _play_turn(ledger, 1)
     _play_turn(ledger, 2, prev_key="step-1", prev_result=None)
-    assert not any(
-        EXECUTION_RESULT_MARKER in str(m.content) for m in ledger.active_messages
-    )
+    assert not any(EXECUTION_RESULT_MARKER in str(m.content) for m in ledger.active_messages)
 
 
 def test_old_turn_recitation_and_ui_list_stripped_at_depth_1():
@@ -197,18 +192,14 @@ def test_pending_grace_then_placeholder_never_backfilled():
     service = _service()
     service._step_inputs["step-1"] = {"step_number": 1}  # pending job, no summary
 
-    ledger = TranscriptLedger(
-        step_memory=service, image_scrub_depth=2, pending_grace_steps=1
-    )
+    ledger = TranscriptLedger(step_memory=service, image_scrub_depth=2, pending_grace_steps=1)
     # Enough turns to push turn 1 past K + grace.
     for i in range(1, 7):
         _play_turn(ledger, i, prev_key=f"step-{i - 1}" if i > 1 else None)
 
     first_obs = ledger.active_messages[0]
     assert not _has_image(first_obs)
-    assert "[visual summary pending; evidence at DataEngine step 1]" in str(
-        first_obs.content
-    )
+    assert "[visual summary pending; evidence at DataEngine step 1]" in str(first_obs.content)
     frozen = _fingerprint(first_obs)
 
     # A late summary must never mutate the frozen message.
@@ -222,17 +213,13 @@ def test_failed_summary_becomes_unavailable_placeholder():
     service._step_inputs["step-1"] = {"step_number": 1}
     service._failed.add("step-1")
 
-    ledger = TranscriptLedger(
-        step_memory=service, image_scrub_depth=2, pending_grace_steps=5
-    )
+    ledger = TranscriptLedger(step_memory=service, image_scrub_depth=2, pending_grace_steps=5)
     for i in range(1, 4):
         _play_turn(ledger, i, prev_key=f"step-{i - 1}" if i > 1 else None)
 
     first_obs = ledger.active_messages[0]
     assert not _has_image(first_obs)
-    assert "[visual summary unavailable; evidence at DataEngine step 1]" in str(
-        first_obs.content
-    )
+    assert "[visual summary unavailable; evidence at DataEngine step 1]" in str(first_obs.content)
 
 
 def test_tool_call_response_pairs_are_never_split():
@@ -296,3 +283,40 @@ def test_no_ago_wording_in_ledger_output():
         )
     blob = " ".join(str(m.content) for m in ledger.active_messages)
     assert " ago" not in blob
+
+
+# ---------------------------------------------------------------------------
+# Session-start anchoring and multi-step turns (Flash profile reuse)
+# ---------------------------------------------------------------------------
+
+
+def test_session_start_anchors_offsets_to_the_data_engine_clock():
+    """With a ``session_start`` epoch the ledger reads the wall clock, so the
+    ``T+mm:ss`` labels are relative to the recorded session start (the same
+    origin as the chunk ledger lines and the video analyzer's timeline)."""
+    now = {"t": 1000.0}
+    ledger = TranscriptLedger(step_memory=_service(), clock=lambda: now["t"], session_start=940.0)
+    assert ledger.elapsed_label() == "T+01:00"
+    now["t"] = 1075.5
+    assert ledger.elapsed_label() == "T+02:15"
+
+
+def test_without_session_start_the_ledger_keeps_its_own_origin():
+    now = {"t": 500.0}
+    ledger = TranscriptLedger(step_memory=_service(), clock=lambda: now["t"])
+    assert ledger.elapsed_label() == "T+00:00"
+    now["t"] = 512.0
+    assert ledger.elapsed_label() == "T+00:12"
+
+
+def test_commit_records_every_step_key_of_a_multi_action_turn():
+    ledger = TranscriptLedger(step_memory=_service())
+    ledger.stage_turn(_turn(1, tool_call_count=2))
+    ledger.commit_staged(step_key="s1", extra_step_keys=["s2", "s1", "s3"])
+    turn = ledger.unchunked_turns()[0]
+    assert turn["step_key"] == "s1"
+    assert turn["step_keys"] == ["s1", "s2", "s3"]
+
+    ledger.stage_turn(_turn(2))
+    ledger.commit_staged(step_key=None)
+    assert ledger.unchunked_turns()[1]["step_keys"] == []