[real-value/bridge] add pilot proof command

[FlowmemoryAI]

Summary

Closes #138.

• Adds the root npm run flowchain:real-value-pilot:bridge proof command for the bridge relayer owner row.
• Extends the bridge relayer with mock pilot and Base 8453 pilot modes covering eth_chainId == 0x2105, approved lockbox checks, confirmation depth, deterministic bridge artifacts, duplicate replay evidence, exactly-once local credit application, and test-record-only withdrawal/release evidence.
• Adds Base 8453 mock fixtures, bridge pilot evidence schemas, a guarded Base pilot observe wrapper, bridge docs, and bridge run notes.
• Refreshes the real-value pilot HQ matrix after PR [real-value/ops] add pilot ops proof command #144 so bridge is pending this PR and strict final-gate blockers are contracts [real-value/contracts] Add pilot contracts proof command #133 and runtime [real-value/runtime] Add pilot runtime proof command #134.

Commands run

• npm run flowchain:real-value-pilot:bridge - passed.
• npm test --prefix services/bridge-relayer - passed, 14 tests.
• npm run bridge:local-credit:smoke - passed.
• [scriptblock]::Create((Get-Content -Raw infra/scripts/bridge-base-mainnet-pilot-observe.ps1)) - passed.
• npm run flowchain:real-value-pilot:e2e -- -AllowIncomplete - passed as an incomplete coordination report; only contracts [real-value/contracts] Add pilot contracts proof command #133 and runtime [real-value/runtime] Add pilot runtime proof command #134 remained missing.
• npm run flowchain:real-value-pilot:e2e - failed clearly as expected; only contracts [real-value/contracts] Add pilot contracts proof command #133 and runtime [real-value/runtime] Add pilot runtime proof command #134 remained missing.
• node infra/scripts/check-unsafe-claims.mjs - passed.
• git diff --check - passed with line-ending warnings only.
• npm run flowchain:product-e2e - passed.
• npm run flowchain:l1-e2e - passed.

Current blockers

• Strict npm run flowchain:real-value-pilot:e2e remains blocked by contracts [real-value/contracts] Add pilot contracts proof command #133 and runtime [real-value/runtime] Add pilot runtime proof command #134 until those owner proof commands land.
• This PR does not run a live Base RPC observation; the default proof is mock-only. The live wrapper requires owner-supplied env values and an explicit capped-pilot acknowledgement.

Scope boundary

This remains a capped owner pilot proof. It does not claim public readiness, production bridge custody, broad deposit availability, or release transaction broadcasting.