fix: update .env.example to VRAMHUB_* prefix with testnet contract IDs

Author: User

.env.example

@@ -1,12 +1,10 @@
-# =============================================================================
 # VRAM Validator — Environment Variables
-# Copy to .env and fill in VRAMHUB_WALLET_MNEMONIC. Everything else is pre-filled.
-# =============================================================================
+# Copy to .env and fill in your wallet mnemonic and R2 credentials.
 
 # ── Sui Wallet ────────────────────────────────────────────────────────────────
 VRAMHUB_WALLET_MNEMONIC=word1 word2 word3 word4 word5 word6 word7 word8 word9 word10 word11 word12
 
-# ── Testnet Contract IDs (pre-filled — do not change) ────────────────────────
+# ── Testnet RPC + Contract IDs ────────────────────────────────────────────────
 VRAMHUB_SUI_RPC_URL=https://fullnode.testnet.sui.io:443
 VRAMHUB_PACKAGE_ID=0x48703e08da129342d7943193c9b9ea17e588b471fe21b13870f16ebc82db0aa8
 VRAMHUB_PEER_REGISTRY_ID=0xc9372571941f8c8ea78c29f0165e898cb813ba9593f3ac47da801a0836fe50e2
@@ -18,7 +16,7 @@ VRAMHUB_HPARAMS_ID=0x68eaa30cdf279cf64e1df8190717631d666718b25df6d6b79f724e7e09e
 VRAMHUB_REWARD_POOL_ID=0x0ca65726ab304f67127d1a2fb9193117e320ffec85be40c9e2b5770c3ad5b2b2
 
 # ── Validator ─────────────────────────────────────────────────────────────────
-VRAMHUB_VALIDATOR_UID=        # set after first run (printed on startup)
+VRAMHUB_VALIDATOR_UID=0
 VRAMHUB_NAUTILUS_URL=http://localhost:3000
 
 # ── Cloudflare R2 (gradient storage) ─────────────────────────────────────────
@@ -27,16 +25,16 @@ VRAMHUB_R2_BUCKET_NAME=
 VRAMHUB_R2_ACCESS_KEY_ID=
 VRAMHUB_R2_SECRET_ACCESS_KEY=
 
-# ── Sui Seal IBE Key Servers ──────────────────────────────────────────────────
+# ── Seal IBE Key Servers ──────────────────────────────────────────────────────
 VRAMHUB_SEAL_KEY_SERVER_IDS=0x73d05d62c18d9374e3ea529e8e0ed6161da1a141a94d3f76ae3fe4e99356db75,0xf5d14a81a982144ae441cd7d64b09027f116a468bd36e7eca494f750591623c8
 VRAMHUB_SEAL_THRESHOLD=2
 
 # ── Mode ──────────────────────────────────────────────────────────────────────
-# VRAMHUB_TEST_MODE=true   → testnet only, no enclave needed (any Linux VPS)
+# VRAMHUB_TEST_MODE=true   → dev/testnet, no Nitro enclave needed
 # VRAMHUB_NITRO_ENCLAVE=true → production, requires AWS Nitro EC2
-VRAMHUB_TEST_MODE=true             # set false when you have a Nitro enclave
+VRAMHUB_TEST_MODE=true
 
-# ── Nitro Enclave (production only — ignored when TEST_MODE=true) ─────────────
-VRAMHUB_NITRO_ENCLAVE=false        # set true on real AWS Nitro EC2
-VRAMHUB_ENCLAVE_PUBKEY=            # hex Ed25519 pubkey from register-enclave
-VRAMHUB_ENCLAVE_OBJECT_ID=         # on-chain enclave object ID
+# ── Nitro Enclave (production only) ──────────────────────────────────────────
+VRAMHUB_NITRO_ENCLAVE=false
+VRAMHUB_ENCLAVE_PUBKEY=
+VRAMHUB_ENCLAVE_OBJECT_ID=