chore(ostool): release v0.15.0

[github-actions]

🤖 New release

• ostool: 0.14.0 -> 0.15.0 (⚠ API breaking changes)

⚠ ostool breaking changes

--- failure constructible_struct_adds_field: externally-constructible struct adds field ---

Description:
A pub struct constructible with a struct literal has a new pub field. Existing struct literals must be updated to include the new field.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field BoardRunConfig.timeout in /tmp/.tmp7WTIrv/ostool/ostool/src/board/config.rs:23

Changelog

0.15.0 - 2026-04-15

Fixed

• (uboot) honor board timeout in serial interaction stage (#88)

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