refactor(sessions): delegate requests and administration to mppx

[gakonst]

Summary

• delegate Tempo session bootstrap, recovery, voucher accounting, top-ups, receipts, discovery, reconciliation, and close flows to MPPx
• use the MPPx Node SQLite ChannelStore at ~/.tempo/wallet/channels.db
• use the MPPx Node Tempo Wallet resolver for active-account and access-key selection from ~/.tempo/wallet/store.json
• retain the exact access key authorized by an existing durable channel across cold processes
• keep the legacy wallet session path only for pre-TIP-1034 rows
• preserve wallet-cli HTTP retry, redirect, proxy, explicit private-key, and interactive-provider behavior

Dependency

Pinned to immutable MPPx preview commit 0c7afa0 from wevm/mppx#713 until its public Node wallet and session-administration helpers are released.

Proof

Current main failed the managed bootstrap regression before retrying the protected request. This branch passes with GET -> HEAD -> GET, delegating bootstrap and rehydration to MPPx. A fresh wallet-cli process also synced the same live mainnet channels.db to the same five TIP-1034 rows reported by MPPx and mpp-rs, including two active OpenAI WebSocket sessions and three recovered orphan sessions. The active OpenAI session retained access key 0x060e…8ff5 even though a different key appears first in store.json.

Validation:

• 118 tests passed
• application and test TypeScript projects passed
• format and lint passed
• shared-store compatibility test passed
• real mainnet session sync passed
• commits have GitHub-verified signatures

[alexrisch]

I'm updating to use newest package since it's released

[alexrisch]

Me like less code