feat: add agentic video analysis and clarify action results

Report device actions as dispatched and preserve full failure details. Route
Flash through McpActionExecutor and use ToolFailure across helper tools and
agent loops instead of inferring failure from response text.

Require model-provided descriptions for coordinate targets. Keep observed
element metadata separate from those descriptions in safety checks, visual
summaries, history, and frontend labels.

Add Gemini Interactions API video analysis with configurable processing mode,
chunk size, and timeouts. Centralize Google provider capabilities and token
usage normalization, and update google-genai to 2.22.0.

Preserve system instructions on follow-up interactions, replan pending chunks
when falling back to static processing, and reject unanswered native video
and audio segments instead of caching placeholder results. Keep helper-tool
failure status intact through history tools and committee calls.

Validation: 1,762 Python unit tests passed (3 skipped), 40 frontend formatter
tests passed, and the production UI build completed. Ruff lint, formatting,
the quality ratchet, and git diff checks passed.

artemis/agents/operator/prompts.py

@@ -33,6 +33,7 @@ from artemis.tools.command_tool import (
 from artemis.utils.logger import get_logger
 from artemis.utils.notes import get_note_file_path
 from artemis.utils.plan_grammar import parse_plan, render_plan_grammar_spec
+from artemis.utils.task_tree import SELF_DESCRIBED_MARKER
 
 logger = get_logger(__name__)
 
@@ -418,7 +419,7 @@ def _max_burst_actions_for_prompt() -> int:
 
 
 def _last_successful_action_before(steps: list, step_number: int | None) -> tuple[str, int] | None:
-    """The most recent step before ``step_number`` whose terminal action executed.
+    """The most recent step before ``step_number`` whose terminal action was dispatched.
 
     Returns ``(clean action description, step number)`` or None. This is the
     Operator's best candidate for the *trigger* of a transient state: the
@@ -437,7 +438,7 @@ def _last_successful_action_before(steps: list, step_number: int | None) -> tupl
         if not action:
             continue
         result = step.get("last_execution_result")
-        if isinstance(result, dict) and result.get("status") not in (None, "success"):
+        if isinstance(result, dict) and result.get("status") not in (None, "dispatched"):
             continue
         candidates.append((number, format_actions_clean(action)))
     if not candidates:
@@ -451,12 +452,13 @@ def _incident_target_label(incident: dict) -> str:
     # The Operator only ever sees 0–1000 coordinates: the recorded pixel
     # target is the controller's business and is never rendered here.
     normalized = action.get("normalized_coordinates")
-    text = action.get("target_text")
     parts = []
     if normalized:
         parts.append(f"normalized {list(normalized)}")
-    if text:
-        parts.append(f'"{text}"')
+    if action.get("target_text"):
+        parts.append(f'"{action["target_text"]}"')
+    elif action.get("target_description"):
+        parts.append(f'"{action["target_description"]}" {SELF_DESCRIBED_MARKER}')
     return " ".join(parts) if parts else "the recorded target"
 
 
@@ -526,7 +528,7 @@ def render_execution_incident(incident: dict, steps: list) -> str:
         )
     elif category in ("target_disappeared", "pixel_target_disappeared"):
         prior_str = (
-            f" Your last successfully executed action was `{prior[0]}` (Step {prior[1]});"
+            f" Your last dispatched action was `{prior[0]}` (Step {prior[1]});"
             " if the vanished target belonged to a state that action summoned, that action"
             " is the trigger."
             if prior