chore: add validate method to forwarding attributes interface

[MalteHerrmann]

This PR adds the Validate() method to the ForwardingAttributes interface, to enforce that all implementations of the interface can be validated.

This is part of the changes that should be introduced in separate PRs as discussed on #45.

Summary by CodeRabbit

• New Features

  • Added a validation hook for forwarding attributes; no behavioral changes expected for end-users in this release.

• Documentation

  • Clarified wording for the counterparty identifier to better reflect it is the destination chain identifier.

[coderabbitai]

Walkthrough

Added a Validate() error method to the ForwardingAttributes interface and implemented Validate() on TestForwardingAttr (returns nil). Also updated the CounterpartyID comment. No other logic or control-flow changes.

Changes

Cohort / File(s)	Summary
Core interfaces types/core/attributes.go	Added Validate() error to the ForwardingAttributes interface; adjusted CounterpartyID comment text.
Test utilities testutil/testdata/testdata.go	Implemented Validate() error method on TestForwardingAttr returning nil.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐇 I hopped through types with a careful eye,
Added Validate() — a tiny try.
Tests whisper back a calm, quiet “nil,”
Comments straightened, the trail looks still.
Little hops forward, code snug and spry.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The pull request title clearly and concisely describes the primary change by stating that a validate method is being added to the ForwardingAttributes interface, directly matching the contents of the changeset without extraneous details.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-validate-to-forwarding-attr

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ed21f65 and 20c9c67.

📒 Files selected for processing (1)

• types/core/attributes.go (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

**/*.go

📄 CodeRabbit inference engine (CLAUDE.md)

**/*.go: Go code must be formatted and pass golangci-lint
All Go files must include license headers

Files:

• types/core/attributes.go

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: build
• GitHub Check: prepare

🔇 Additional comments (2)

types/core/attributes.go (2)

37-37: LGTM!

The docstring clarification improves the documentation quality and follows Go conventions.

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39-40: All ForwardingAttributes implementations define Validate() Confirmed that every type implementing ForwardingAttributes includes a Validate() method, so the interface change is safe.

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[0xstepit]

Just a minor change and we are good to merge it.