Add execution waves documentation and function-level evidence readiness memo

- Created `execution-waves.md` to outline the execution waves for sprints, detailing shared prerequisites, parallelism guidance, and specific sprints involved in each wave.
- Added `function-level-evidence.md` to capture the requirements for stable function-level evidence in Stella Ops scanners, including goals, scope, advisory requirements, workstreams, schema/API touchpoints, and a handoff checklist for the next agent.

docs/implplan/SPRINT_140_runtime_signals.md

@@ -4,4 +4,13 @@ Active items only. Completed/historic work now resides in docs/implplan/archived
 
 This file now only tracks the runtime & signals status snapshot. Active backlog lives in Sprint 141+ files.
 
+# Wave coordination
+
+| Wave | Guild owners | Shared prerequisites | Status | Notes |
+| --- | --- | --- | --- | --- |
+| 140.A Graph | Graph Indexer Guild · Observability Guild | Sprint 120.A – AirGap; Sprint 130.A – Scanner (phase I tracked under `docs/implplan/SPRINT_130_scanner_surface.md`) | TODO | Hold until Scanner surface work emits the analyzer artifacts required for clustering jobs. |
+| 140.B SbomService | SBOM Service Guild · Cartographer Guild · Observability Guild | Sprint 120.A – AirGap; Sprint 130.A – Scanner | TODO | Projection schema remains blocked on Concelier outputs; keep AirGap parity requirements in scope. |
+| 140.C Signals | Signals Guild · Authority Guild (for scopes) · Runtime Guild | Sprint 120.A – AirGap; Sprint 130.A – Scanner | DOING | API skeleton and callgraph ingestion are active; runtime facts endpoint still depends on the same shared prerequisites. |
+| 140.D Zastava | Zastava Observer/Webhook Guilds · Security Guild | Sprint 120.A – AirGap; Sprint 130.A – Scanner | TODO | Surface.FS integration waits on Scanner surface caches; prep sealed-mode env helpers meanwhile. |
+
 # Sprint 140 - Runtime & Signals