Fix nightly Rust CI compatibility

[tdenisenko]

Summary

This fixes the three failing GitHub Actions jobs on master: Check, Clippy, and Test. All three failed during compilation before tests could run; Format already passed.

Root cause

The repository follows the rolling nightly Rust toolchain. The current GitHub runner compiler now denies semicolon_in_expressions_from_macros, and eyre::bail! expands with a trailing semicolon. Seven call sites in the peer request manager used bail! as the final expression of a block or function, so the new compiler rejected them.

Changes

• Terminated all seven affected bail! invocations as statements.
• Preserved the existing early-return behavior and error messages.
• Kept the fix local to the affected call sites; no dependency or toolchain policy changes were required.
• Searched the Rust workspace for other expression-position bail! uses and found none requiring changes.

Validation

Passed locally:

• cargo fmt --all -- --check
• RUSTFLAGS=-Dsemicolon_in_expressions_from_macros cargo check --workspace
• cargo check --workspace
• cargo clippy --workspace -- -D warnings
• cargo test --workspace
• git diff --check

The strict-lint workspace check explicitly reproduces the failure mode enforced by the newer GitHub nightly compiler. The full test run passed 689 tests; one benchmark harness remained intentionally ignored.