[puddly]

These were earlier experiments that ran Ziggurat on bare metal, without using OpenThread RCP as a HAL. We're going to go with OpenThread RCP as a HAL for the foreseeable future and no longer need these crates.

[Copilot]

🟢 Approval recommended

No active review issues block the removal of the legacy ESP experiments.

No open issues 🎉

What changed in this PR

Removes the legacy bare-metal ESP experiments, aligning Ziggurat with the continued use of OpenThread RCP as its hardware abstraction layer.

Changes:

• Deletes the ziggurat-esp firmware and ziggurat-phy-esp radio backend, including their build configuration and lockfiles.
• Removes the deleted crates from workspace exclusions.
• Updates comments in the remaining OpenThread-related crates without changing their behavior.

File	Description
crates/​ziggurat-phy-otlink/​src/​lib.rs	Removes a legacy backend comparison from documentation.
crates/​ziggurat-phy-esp/​src/​lib.rs	Deletes the native ESP radio backend.
crates/​ziggurat-phy-esp/​Cargo.toml	Deletes the radio backend manifest.
crates/​ziggurat-phy-esp/​Cargo.lock	Deletes the radio backend lockfile.
crates/​ziggurat-ncp-api/​Cargo.toml	Updates the workspace comment to omit the removed firmware.
crates/​ziggurat-esp/​src/​main.rs	Deletes the ESP hardware bring-up entry point.
crates/​ziggurat-esp/​src/​hw_crypto.rs	Deletes the legacy ESP hardware crypto backend.
crates/​ziggurat-esp/​rust-toolchain.toml	Deletes the firmware-specific toolchain configuration.
crates/​ziggurat-esp/​Cargo.toml	Deletes the firmware manifest and dependency patches.
crates/​ziggurat-esp/​Cargo.lock	Deletes the firmware lockfile.
crates/​ziggurat-esp/​.cargo/​config.toml	Deletes the ESP build and flashing configuration.
Cargo.toml	Removes obsolete exclusions and updates workspace comments.

_{Review effort: Balanced}