fix: replace CIP56TransferFactory with AllocationFactory in USDCx bootstrap

[sadiq1971]

Summary

• Replaces CIP56TransferFactory (atomic, local-only) with DA's AllocationFactory from utility_registry_app_v0 — this factory creates TransferOffer contracts on TransferFactory_Transfer, matching devnet behaviour where the receiver must exercise TransferInstruction_Accept
• Adds bootstrap of TransferRule (required in choiceContextData at accept time) and InstrumentConfiguration (with empty holderRequirements, so no credential contracts needed locally)
• Adds --registry-app-package-id and --registry-package-id flags with defaults from deployments/usdcx-dars/manifest.json; docker-bootstrap.sh requires no changes

Test plan

• Run docker compose up and verify bootstrap completes without error
• Run scripts/testing/find-transfer-rule.go against local devnet and confirm TransferRule is visible
• Initiate a USDCx transfer and confirm a TransferOffer contract appears on the ledger (via list-all-contracts.go)
• Confirm existing DEMO token E2E tests are unaffected

Closes #258

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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##             main     #265   +/-   ##
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  Coverage        ?   32.35%           
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  Files           ?      127           
  Lines           ?     8968           
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  Hits            ?     2902           
  Misses          ?     5817           
  Partials        ?      249           

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[gemini-code-assist]

Code Review

This pull request updates the USDCx bootstrap script to utilize the utility_registry_app_v0 framework, replacing the legacy CIP56TransferFactory with AllocationFactory, TransferRule, and InstrumentConfiguration. It also refactors contract lookup functions to support specific package IDs. Review feedback recommends defining template identifiers as constants to prevent typos and enhancing command ID generation with a random component to ensure uniqueness during rapid script execution.

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scripts/setup/bootstrap-usdcx.go (100)

Module and entity names like "CIP56.Token" and "CIP56Manager" are used as string literals. To improve code clarity and reduce the risk of typos, it's better to define these as constants.

This practice should be applied to all template identifier strings used in this file, such as in findContractByPkg calls and create... functions.

scripts/setup/bootstrap-usdcx.go (332)

Using time.Now().UnixNano() for CommandId does not guarantee uniqueness across different runs of the script, which could lead to unintended command deduplication if the script is executed in very quick succession. A more robust approach would be to include a random component to ensure the command ID is unique.

This applies to createTransferRule (line 361) and createInstrumentConfiguration (line 390) as well.