Align Dependabot coverage and add the dev-fast build fragment

[leynos]

Summary

This branch applies Wave 1 of the Rust estate baseline remediation
(Operation Parabellum, phase 2). It aligns
.github/dependabot.yml
with the canonical Dependabot reference: one update stanza per package
ecosystem the repository uses (cargo, rust-toolchain, github-actions), each stanza labelled
dependencies plus its channel label, and GitHub Actions updates batched
into a single pull request via a wildcard group. It also adds the opt-in dev-fast build
fragment with dev-build and dev-test Make targets, signposted in
AGENTS.md.

Review walkthrough

• Start with
  .github/dependabot.yml
  for the ecosystem coverage and labels.
• Then review
  tools/dev-fast/config.toml
  — a copy of the canonical fragment — and the dev-build/dev-test
  targets appended to the
  Makefile.
• Finish with the signposting section appended to
  AGENTS.md.

Validation

• Audited the amended tree with the Concordat rule packages
  dependabot-baseline and rust-dev-fast-baseline: dependabot-baseline compliant, rust-dev-fast-baseline compliant.

Notes

• The canonical labels (including the Dependabot channel labels this
  configuration references) were created on the repository ahead of this
  pull request, so no stanza names a missing label.
• The dev-fast fragment is strictly opt-in local tooling: it is only
  applied when passed explicitly with --config, so continuous
  integration, release, coverage, and verification builds are untouched.
  The targets need a nightly toolchain and, on Linux, a mold binary on
  the PATH; repositories still pinned to stable gain the wiring now and
  the capability when Wave 2 moves the pin to nightly.

Summary by Sourcery

Align automated dependency updates and add opt-in accelerated development build tooling.

New Features:

• Introduce opt-in dev-fast build fragment with Cranelift and mold configuration for faster local debug builds.
• Add dev-build and dev-test Make targets that use the dev-fast configuration for accelerated compilation and testing.

Enhancements:

• Document fast development build workflow and constraints in AGENTS.md for local developer usage.

Build:

• Extend Dependabot configuration to cover rust-toolchain updates with appropriate dependency labels and weekly schedule.

Documentation:

• Add guidance on using dev-fast builds, including tooling prerequisites and impact scope, to AGENTS.md.

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[sourcery-ai]

Reviewer's Guide

Aligns Dependabot configuration with the canonical Rust baseline and introduces an opt‑in dev-fast Cargo config plus Make targets and documentation for accelerated local debug builds.

Sequence diagram for opt-in dev-fast debug build flow

sequenceDiagram
  actor Dev
  participant Makefile
  participant Cargo
  participant Cranelift_backend
  participant Mold_linker
  participant System_linker

  Dev->>Makefile: make dev-build
  Makefile->>Cargo: cargo --config tools/dev-fast/config.toml build
  Cargo->>Cranelift_backend: apply profile.dev codegen-backend=cranelift
  alt [target_os = linux]
    Cargo->>Mold_linker: link with -Clink-arg=-fuse-ld=mold
  else [non-linux]
    Cargo->>System_linker: link with default platform linker
  end

Loading

File-Level Changes

Change	Details	Files
Add opt-in dev-fast build and test targets wired to a separate Cargo config fragment for faster local debug builds.	Introduce DEV_FAST_CONFIG variable defaulting to tools/dev-fast/config.toml. Define phony dev-build and dev-test Make targets that call cargo build/test with the explicit --config argument. Document that these targets use Cranelift and mold and require a nightly toolchain.	Makefile
Document the dev-fast build workflow and its constraints for local development.	Add a 'Fast development builds' section explaining make dev-build and make dev-test. Clarify requirements: nightly toolchain, mold on PATH for Linux. Explain that the dev-fast config is passed explicitly and must not be copied into .cargo/config.toml to avoid affecting CI, release, and verification builds.	AGENTS.md
Extend Dependabot coverage to the rust-toolchain ecosystem with canonical labels and schedule.	Add a rust-toolchain update stanza scoped to repository root. Apply standard labels: dependencies and rust-toolchain. Schedule weekly checks via Dependabot for rust-toolchain updates.	.github/dependabot.yml
Provide the canonical dev-fast Cargo configuration fragment for opt-in accelerated debug builds using Cranelift and mold.	Create tools/dev-fast/config.toml with an [unstable] section enabling codegen-backend. Configure [profile.dev] to use the Cranelift codegen backend for faster compilation. Add a Linux-only [target.'cfg(target_os = "linux")'] rustflags entry to use the mold linker. Include detailed comments about why the fragment is kept out of .cargo/config.toml and how to restate repository-wide rustflags if needed.	tools/dev-fast/config.toml

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[leynos]

The spelling gate failed on this branch because the appended dev-fast text names the mold linker, which the en-GB-oxendict dictionary read as a misspelling of “mould”. The follow-up commit accepts the word via the estate's correction-to-itself pattern in typos.local.toml (mirrored in the generated dictionary); the AGENTS.md and Makefile hunks are untouched, so the companion parabellum-wave-2-3 branches still merge cleanly where they exist.