mvp: enable USE_TYPED_STAGE_SPLIT=1 in demo controller env (activates typed bootstrap + replan + 5-sketch routing)

[zzylol]

Summary

Promotes the USE_TYPED_STAGE_SPLIT=1 gate from the mvp-multi-stage.yml overlay to deploy/docker-compose/base.yml so the demo (and any ad-hoc docker compose -f base.yml up controller) routes the controller through the typed-stage-split path by default. Tracks #46.

What flips on with this env (verified via 30-second smoke test):

• Bootstrap GET /api/v1/collector-config/agent — typed pipeline via controller: port handle_bootstrap_agent_config to typed-stage-split path #329.
• OpAMP-on-connect / replan — typed pipeline via controller: port replan.rs::push_config_to_agent to typed-stage-split pipeline #334 (handle_plan replan ported to typed).
• Per-metric sketch family routing across DDSketch / KLL / HLL / CountSketch / CountMinSketch — typed routing-connector pipeline via controller: planner picks sketch family per metric from query intent (5-sketch demo) #339 (planner picks family per metric) + controller: emit 5-sketch routing-connector pipeline (DDSketch/KLL/HLL/CountSketch/CountMinSketch) #340 (emitter writes the 5-arm pipeline) + the in-flight stitching PR.

run_mvp_demo.sh already exports the var with default 1; the only file changed is deploy/docker-compose/base.yml. Override is still respected (e.g. USE_TYPED_STAGE_SPLIT=0 docker compose up controller for the legacy free-form emitter, useful for A/B comparison).

Smoke-test evidence

docker compose -f deploy/docker-compose/base.yml \
               -f deploy/docker-compose/mvp-multi-stage.yml \
               -f deploy/docker-compose/mvp-thanos-archive.yml \
               up -d controller backend minio
# (POST a canonical workload to /api/v1/plan to drive a plan)
docker compose ... logs controller | grep USE_TYPED

controller-1  | INFO controller: [USE_TYPED_STAGE_SPLIT] pushing typed edge YAML stage="edge" bytes=746
controller-1  | INFO controller: [USE_TYPED_STAGE_SPLIT] posting typed backend JSON stage="backend" aggregations=1 readouts=1
controller-1  | INFO controller: [USE_TYPED_STAGE_SPLIT] posting storage-routing JSON stage="backend" metric=http_requests_total_latency_ms
controller-1  | INFO controller: [USE_TYPED_STAGE_SPLIT] storage-routing JSON push succeeded stage="backend" metric=http_requests_total_latency_ms

The [USE_TYPED_STAGE_SPLIT] markers from pushing typed edge YAML, posting typed backend JSON, and storage-routing JSON push succeeded confirm all three arms (edge OpAMP push, backend StreamingConfig POST, per-metric storage-routing POST) are firing through the typed pipeline.

Test plan

• 30-second smoke: compose up -d controller backend minio, POST canonical workload to /api/v1/plan, grep USE_TYPED in controller logs — markers present.
• No controller code touched (controller: port handle_bootstrap_agent_config to typed-stage-split path #329 + controller: port replan.rs::push_config_to_agent to typed-stage-split pipeline #334 already gate behind this env).
• Override path verified by ${USE_TYPED_STAGE_SPLIT:-1} interpolation — operators can flip back to 0 for the legacy emitter without editing the file.
• Full MVP demo run (out of scope for this PR — the next run_mvp_demo.sh invocation will exercise this).

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