Rename x402-common to payment-common

[juntao]

Summary

• Rename directory x402-common to payment-common
• Update package name from x402_common to payment_common
• Update all Cargo.toml dependencies and source file imports
• Update documentation references in CLAUDE.md, README.md, and PLAN.md

Test plan

• cargo build --release succeeds
• cargo test --all passes (8 tests)
• cargo fmt --all applied
• No remaining references to x402-common or x402_common

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR successfully renames the x402-common directory to payment-common as part of a broader effort to generalize the payment infrastructure beyond the x402 protocol. The renaming is comprehensive and includes updates to the package name, all import statements, dependency references, and most documentation.

Changes:

• Renamed directory from x402-common to payment-common and updated the Rust package name from x402_common to payment_common
• Updated all Cargo.toml dependency references across workspace members (payment-config, pay, get-address, create-wallet)
• Updated all import statements and type references in source files to use the new payment_common module path
• Updated documentation in README.md, PLAN.md, and CLAUDE.md to reflect the new naming

Reviewed changes

Copilot reviewed 13 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Cargo.toml	Updated workspace member from x402-common to payment-common
payment-common/Cargo.toml	Renamed package from x402_common to payment_common and updated description
payment-common/src/lib.rs	New file with common utilities and exports (formerly in x402-common)
payment-common/src/error.rs	New file with error types (formerly in x402-common)
payment-common/src/config.rs	New file with configuration management (formerly in x402-common)
payment-common/src/wallet.rs	New file with wallet operations (formerly in x402-common)
payment-config/Cargo.toml	Updated dependency reference from x402_common to payment_common
payment-config/src/main.rs	Updated imports and type references to use payment_common
pay/Cargo.toml	Updated dependency reference from x402_common to payment_common
pay/src/main.rs	Updated imports to use payment_common
get-address/Cargo.toml	Updated dependency reference from x402_common to payment_common
get-address/src/main.rs	Updated imports to use payment_common
create-wallet/Cargo.toml	Updated dependency reference from x402_common to payment_common
create-wallet/src/main.rs	Updated imports and type references to use payment_common
README.md	Updated crate name in architecture table from x402-common to payment-common
PLAN.md	Updated all references to the shared library from x402-common to payment-common
CLAUDE.md	Updated directory reference from x402-common/ to payment-common/

Comments suppressed due to low confidence (1)

create-wallet/src/main.rs:10

• The documentation comment still references "x402 payments" which should be updated to just "payments" for consistency with the renaming. This comment appears in both the doc comment on line 7 and the command description on line 10.

/// Create a new Ethereum-compatible wallet for x402 payments
#[derive(Parser, Debug)]
#[command(name = "create-wallet")]
#[command(about = "Create a new Ethereum-compatible wallet for x402 payments")]

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