chore: release 0.48.1 — derive CandidType for delegation types

[lwshang]

Summary

Prepares the 0.48.1 release (targeting 2026-07-07).

Follow-up to #734: derive candid::CandidType for Delegation, SignedDelegation, and DelegationPermissions so downstreams can use them directly in Candid interfaces (e.g. matching Internet Identity's Delegation/SignedDelegation).

Changes

• ic-transport-types: added CandidType to the derives on Delegation, SignedDelegation, DelegationPermissions. Generated Candid:

  type Delegation = record { pubkey: blob; expiration: nat64; targets: opt vec principal; permissions: opt DelegationPermissions };
  type SignedDelegation = record { delegation: Delegation; signature: blob };
  type DelegationPermissions = variant { queries; all };
  

  The serde_bytes byte fields map to blob, serde renames are honored, and the extra permissions field is opt — so the encoding stays Candid-subtype-compatible with delegation interfaces that omit it.
• Version bump 0.48.0 → 0.48.1 (workspace version + internal path-dep pins in Cargo.toml, Cargo.lock refreshed).
• CHANGELOG.md: new ## [0.48.1] - 2026-07-07 section.

This is a purely additive trait impl — no breaking changes.

Verification

• cargo build --workspace --locked ✅
• cargo test -p ic-transport-types ✅ (12 passed)
• cargo clippy -p ic-transport-types ✅ (clean)

Release steps after merge

• Merge to main
• Manually dispatch the Publish to crates.io workflow (workflow_dispatch) — publishes in dependency order, idempotent/retry-safe

🤖 Generated with Claude Code

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 6407a85.

Security Overview

• 🔎 Scanned files: 4 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/a3a96bf1-e1e7-4946-9d69-cd1493c911f8?scanId=d3a5a57a-76b8-464f-9143-aeee73af86f9&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► ic-transport-types/src/lib.rs       Derive CandidType for Delegation, DelegationPermissions, and SignedDelegation