control-plane: emit fused asap_edge edge config

[zzylol]

Summary

The edge agent replaced the old routing-connector per-family fan-out (DDSketch/KLL/HLL/CountSketch/CountMinSketch + raw passthrough + gorillas3 cold processor) with ONE fused asap_edge processor in a single pipeline. This teaches the control-plane to emit that shape.

New emit_edge_yaml_asap_edge(cfg, opamp_endpoint, agent_id) produces:

otlp -> [memory_limiter, cumulativetodelta, asap_edge] -> otlp/backend

with a single metrics pipeline, opamp extension, and an asap_edge processor carrying shard_count, window_duration, drop_original, a metrics[] map, and a cold: block — matching the hand-written contract in deploy/mvp-multinode/configs/asap/asap-otel-agent-b6-asap-single-sketch.yaml.

Mapping (all from existing EdgeStageConfig fields)

• sketch families: metric_to_family x sketch_processors params -> per-entry relative_accuracy (ddsketch) / k (kll) / nothing (hll) / rows+cols (countsketch, countminsketch), mirroring build_edge_processor_block.
• sum family: every AggRole::Sum metric (in cumulative_counter_metrics) that has grouping labels declared and is NOT routed to a sketch family -> { metric, family: sum, aggregate_by: [<group_by_labels>] }. Same predicate the routing path's metrics/sum_aggregate selection uses; the group-by labels come from metric_to_grouping_labels (sourced from workload.group_by_labels).
• cumulativetodelta.include.metrics: cumulative_counter_metrics (the sum metrics plus the counter-shaped sketch inputs), match_type: strict.
• cold block: enabled when the plan declared any archive_tier_metrics; block_duration from the archive window.

Wiring

emit_edge_yaml dispatches to the fused emitter when ASAP_EDGE_FUSED is set (default off), else keeps the 5-sketch routing emit. Env-gate (mirroring typed_stage_split_enabled() / ASAP_AGENT_MEMORY_LIMIT_MIB) is used instead of a new EdgeStageConfig field so the change is additive: no struct-literal churn across ~17 construction sites, no serde wire-shape bump, both paths read identical cfg fields, and the entire existing routing-emit test surface is unchanged. The flag is the canonical migration switch; the default flips to on once the fused agent build is the default deployment (and the routing path is retired).

Reported gap (not fabricated)

EdgeStageConfig does NOT carry a cold ship_endpoint or an external_labels map today (only the S3/MinIO knobs build_gorillas3_yaml reads from controller env). Following the emitter's documented-placeholder convention for unresolved deploy targets (resolve_export_endpoint), ship_endpoint is derived from the OTLP backend host (http://<host>:9098/ingest/gorilla) and external_labels.cluster reads ASAP_CLUSTER (default asap-mvp). Threading a real per-deploy cold endpoint + external-label map needs a new EdgeStageConfig field populated from the plan -- left as a follow-up (clearly commented in code).

Test plan

• cargo build -p control_plane clean (no new warnings)
• cargo test -p control_plane --lib emit::stage_config (84 pass, incl. 2 new)
• cargo test -p control_plane --lib (769 pass)
• New fused_asap_edge_emits_single_pipeline_and_metrics_list: YAML parses, single metrics pipeline [memory_limiter, cumulativetodelta, asap_edge], sum-by + 5 sketch metrics[] entries with correct params, cold block present/enabled, cumulativetodelta strict include list
• New fused_gate_off_keeps_routing_shape: gate-off keeps the routing-connector shape (backward compat)

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