feat(M09): introduce RuntimeContext and attach to processing object

- Add modules/runtime_context.py with RuntimeContext dataclass
- Attach p.runtime_context in process_images_inner() after opts_snapshot
- Write-only: no migration of shared.* reads yet
- Completes Phase II runtime seam preparation

Made-with: Cursor

docs/milestones/M09/M09_toolcalls.md

@@ -5,4 +5,8 @@ Implementation toolcalls for Cursor execution.
 | Timestamp | Tool | Purpose | Files/Target | Status |
 |-----------|------|---------|--------------|--------|
 | 2026-03-11 | write | Populate M09_plan.md with full plan | docs/milestones/M09/M09_plan.md | completed |
-| 2026-03-11 | run | git checkout main, pull, create branch | git | pending |
+| 2026-03-11 | run | git checkout main, pull, create branch | git | completed |
+| 2026-03-11 | write | Create modules/runtime_context.py | modules/runtime_context.py | completed |
+| 2026-03-11 | search_replace | Attach RuntimeContext in process_images_inner | modules/processing.py | completed |
+| 2026-03-11 | run | pytest test/smoke | test/smoke | pending |
+| 2026-03-11 | run | pytest test/quality | test/quality | pending |

modules/processing.py

@@ -27,6 +27,7 @@ import modules.face_restoration
 import modules.images as images
 import modules.styles
 from modules.opts_snapshot import create_opts_snapshot
+from modules.runtime_context import RuntimeContext
 import modules.prompt_seed_prep as prompt_seed_prep
 import modules.runtime_utils as runtime_utils
 import modules.sd_models as sd_models
@@ -893,6 +894,13 @@ def process_images_inner(p: StableDiffusionProcessing) -> Processed:
 
     prompt_seed_prep.prepare_prompt_seed_state(p)
     p.opts_snapshot = create_opts_snapshot(shared.opts)
+    p.runtime_context = RuntimeContext(
+        model=shared.sd_model,
+        opts_snapshot=p.opts_snapshot,
+        device=shared.device,
+        state=shared.state,
+        cmd_opts=shared.cmd_opts,
+    )
 
     if os.path.exists(cmd_opts.embeddings_dir) and not p.do_not_reload_embeddings:
         model_hijack.embedding_db.load_textual_inversion_embeddings()

modules/runtime_context.py

@@ -0,0 +1,18 @@
+"""Runtime execution context for generation runs.
+
+M09: Lightweight context grouping model, opts_snapshot, device, state,
+cmd_opts. Attached to processing object as p.runtime_context.
+Write-only in M09; not yet consumed by runtime.
+"""
+from dataclasses import dataclass
+
+
+@dataclass
+class RuntimeContext:
+    """Groups runtime dependencies for the generation pipeline."""
+
+    model: object
+    opts_snapshot: object
+    device: object
+    state: object
+    cmd_opts: object