fix: project rig dolt env into exec-backed controller stores

[azanar]

Summary

This fixes rig-scoped exec-backed controller stores so they receive the same projected Dolt environment that one-shot scoped store opens already receive.

What changed

• update controllerState.openRigStore() to inject scoped Dolt host/port env for exec providers that use the bd store contract
• add a focused regression test for exec:gc-beads-bd rig stores opened through the controller path

Why

openStoreAtForCity() already projects scoped Dolt env for exec:gc-beads-bd, but the controller's long-lived rig store path did not. That let rig-scoped cached/controller store operations diverge from direct gc bd --rig ... behavior and still resolve to 127.0.0.1:0 in later reconcile/order-dispatch paths.

This makes the controller path use the same scoped target projection as the direct store-open path.

Tests

• go test ./cmd/gc -run 'TestControllerState(OpenRigStoreExecProjectsRigTarget|OpenRigStoreExecBdProjectsRigDoltEnv)|TestOpenStoreAtForCityExecUsesUniversalStoreTargetEnv' -count=1

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[sjarmak]

Thanks @azanar — direct parity port of the openStoreAtForCity rig branch into controllerState.openRigStore(). Eliminates the 127.0.0.1:0 divergence on cached/controller rig-store ops without expanding blast radius, and reuses the in-hand cfg instead of loadCityConfig-ing again (small efficiency win over the direct path). The positive case is covered by TestControllerStateOpenRigStoreExecProjectsRigTarget; the negative case (non-bd exec providers don't get the projection) is implicitly covered by the same test's leak check. Good to merge.

Sibling-batch context: complementary to #1766 (which hardens the upstream resolvedRuntimeCityDoltTarget that bdRuntimeEnvForRig resolves through). No conflict; merge order doesn't matter.

Future cleanup (don't block on it): the two rig branches now share ~12 lines of env-projection logic — worth an applyExecRigDoltEnv(...) helper once a third caller appears.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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