Add Token-2022 group Pinocchio example

[MarkFeder]

Pinocchio port of tokens/token-2022/group, mirroring the anchor example.

• Creates a Token-2022 mint (the [b"group"] PDA) carrying the GroupPointer extension, pointing at itself as both pointer authority and group address.
• The GroupPointer (discriminator 40 / sub 0) is initialized before InitializeMint2; the mint is created via a PDA-signed CreateAccount (invoke_signed).
• Follows the anchor example in leaving the actual TokenGroupInitialize out — the group/member data instructions aren't live on Token-2022 yet.
• LiteSVM test asserts the mint is 234 bytes and decodes the GroupPointer extension (authority + group address both the mint PDA).

All CPIs are hand-built (no pinocchio Token-2022 crate).

[greptile-apps]

Greptile Summary

The PR adds a Pinocchio implementation of the Token-2022 group example, creating a PDA-owned mint with a self-referential GroupPointer extension.

• Adds the new Rust program to the workspace and provides build/deployment scripts.
• Hand-builds the System Program and Token-2022 CPIs for account creation, extension initialization, and mint initialization.
• Adds a LiteSVM test that verifies ownership, allocation size, and decoded GroupPointer fields.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or non-blocking defects identified.

The PDA derivation and signing scheme are aligned, the extended mint is allocated and initialized in the required order, the hand-built instruction layouts match established sibling implementations, and the test covers the resulting on-chain account shape.

Important Files Changed

Filename	Overview
tokens/token-2022/group/pinocchio/program/src/instructions/initialize_group.rs	Implements canonical PDA validation, rent-funded mint creation, GroupPointer initialization, and base mint initialization in the required order; no actionable defect was established.
tokens/token-2022/group/pinocchio/program/src/processor.rs	Routes the program's single data-free operation directly to the initialization handler.
tokens/token-2022/group/pinocchio/tests/test.ts	Exercises the complete LiteSVM flow and validates the mint owner, 234-byte layout, and both pointer fields.
tokens/token-2022/group/pinocchio/package.json	Adds build and test commands with dependencies consistent with nearby Token-2022 Pinocchio examples.
Cargo.toml	Registers the new program as a workspace member.

_{Reviews (1): Last reviewed commit: "token-2022 group: add pinocchio example" | Re-trigger Greptile}

[MarkFeder]

@amilz could you take a look at this one when you get a chance?

No open review threads left on it, so it is ready for maintainer review. It is one of 23 open Pinocchio ports I have up — they are independent and self-contained, so they can be reviewed and merged in any order: https://github.com/solana-developers/program-examples/pulls/MarkFeder