feat: remove deployer privilege from RPB — DAO is sole authority

RPB.sol no longer inherits Ownable. The deployer has zero privilege after
deployment; all governance flows through the DAO (timelock). No initial
token supply is minted — ATN emerges from training rewards funded by
investor share purchases.

Changes:
- Remove Ownable import/inheritance, INITIAL_SUPPLY, deployer mint
- Add onlyDAO modifier, replace all owner() checks with dao
- Add onlyOperator for high-frequency ops (training, inference, epochs)
- Constitution governed by onlyDAO, not onlyOwner
- RPBFactory no longer calls transferOwnership
- Wire sponsor-side RPB inference (Path A) with no-chaining guard
- Add LLM backbone encoder for JEPA training
- TextJEPA VICReg + alignment-weighted FedAvg merge
- P2P inference handler, training feed constitution injection
- Integration test: 7 tests covering full training loop

301 Hardhat tests passing, 0 failing.

Author: EightRice

artifacts/contracts/bridge/InferenceProviderBridge.sol/InferenceProviderBridge.dbg.json

@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "..\\..\\..\\build-info\\713a550cb2fb9e77d8044a308356834d.json"
+  "buildInfo": "..\\..\\..\\build-info\\c883fd92018769a6b11683781b8ba6b9.json"
 }

artifacts/contracts/bridge/InferenceProviderBridge.sol/InferenceProviderBridge.json

@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "..\\..\\..\\build-info\\713a550cb2fb9e77d8044a308356834d.json"
+  "buildInfo": "..\\..\\..\\build-info\\c883fd92018769a6b11683781b8ba6b9.json"
 }

artifacts/contracts/bridge/InferenceProviderFactory.sol/InferenceProviderFactory.dbg.json

@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "..\\..\\..\\build-info\\713a550cb2fb9e77d8044a308356834d.json"
+  "buildInfo": "..\\..\\..\\build-info\\c883fd92018769a6b11683781b8ba6b9.json"
 }

artifacts/contracts/bridge/InferenceProviderFactory.sol/InferenceProviderFactory.json

@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "..\\..\\..\\build-info\\713a550cb2fb9e77d8044a308356834d.json"
+  "buildInfo": "..\\..\\..\\build-info\\c883fd92018769a6b11683781b8ba6b9.json"
 }

artifacts/contracts/core/ForcedErrorRegistry.sol/ForcedErrorRegistry.dbg.json

@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "..\\..\\..\\build-info\\713a550cb2fb9e77d8044a308356834d.json"
+  "buildInfo": "..\\..\\..\\build-info\\c883fd92018769a6b11683781b8ba6b9.json"
 }