feat: prepare 2.2.0 with UI and execution fixes

Add dark theme, richer Markdown and readable plugin results.
Improve Android input evidence, response integrity and diagnostics.
Unify lifecycle, guidance receipts and evidence sources across clients.
Keep direct action dispatch without an added AI quota approval layer.
Align version metadata at 2.2.0 and bundle Helper 1.2.2.

Validation: 3063 backend tests before the version bump; 44 after.
Frontend: 317 tests and production build passed.

artemis/graph/checkpoints.py

@@ -40,6 +40,7 @@ from typing import Any, Literal
 
 from pydantic import BaseModel, Field
 
+from artemis.runtime.cancellation import CancellationReason
 from artemis.utils.logger import get_logger
 from artemis.utils.notes import append_note_content, get_note_file_path
 from artemis.utils.plan_grammar import (
@@ -1030,7 +1031,7 @@ async def spawn_pending_checkpoints(ctx, state, anchor_step_id: str | None) -> l
                 # including failures, are never dropped), ledger-only.
                 findings.extend(harvest_run(ctx, state, old_run, allow_side_effects=False))
             else:
-                old_run.task.cancel()
+                old_run.task.cancel(CancellationReason.SUPERSEDED)
                 try:
                     await old_run.task
                 except (asyncio.CancelledError, Exception) as exc:
@@ -1088,14 +1089,16 @@ async def settle_all_checkpoints(ctx, state) -> None:
 
     timeout = float(_setting(ctx, "settlement_timeout", 120.0))
     tasks = [r.task for r in runs]
+    cancel_reason = CancellationReason.OUTER_TIMEOUT
     try:
         _done, pending = await asyncio.wait(tasks, timeout=timeout)
     except Exception as e:
         logger.error(f"Settlement wait failed: {e}")
+        cancel_reason = CancellationReason.UNKNOWN
         pending = {t for t in tasks if not t.done()}
 
     for t in pending:
-        t.cancel()
+        t.cancel(cancel_reason)
     for t in pending:
         try:
             await t

artemis/graph/graph.py

@@ -63,6 +63,7 @@ from artemis.graph.perception import perception_node
 from artemis.graph.state import State
 from artemis.graph.visibility import strict_state
 from artemis.llm.diagnostics import final_review_error_text
+from artemis.runtime.cancellation import CancellationReason
 from artemis.services.llm import final_review_budget
 from artemis.tools.command_tool import (
     HANG_GUIDANCE,
@@ -816,7 +817,7 @@ async def _process_plan_write(
 
             if ctx.planner_task and not ctx.planner_task.done():
                 # A newer write supersedes the in-flight validation.
-                ctx.planner_task.cancel()
+                ctx.planner_task.cancel(CancellationReason.SUPERSEDED)
 
             ctx.pending_validated_plan = content_after
             initial_goal = (

artemis/graph/perception.py

@@ -148,6 +148,7 @@ async def perception_node(state: State, ctx: ArtemisContext) -> dict:
             injected_instruction = injected_payload.get("instruction")
             user_stop_requested = bool(injected_payload.get("release_loop"))
             if isinstance(injected_instruction, str) and injected_instruction.strip():
+                ctx.rejected_pixel_targets = {}
                 # User guidance outranks the plan's declared standards: every
                 # check line that exists right now loses its machine
                 # restoration for the rest of the run (kept on the run context,