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 Dependabot configuration with Rust tooling coverage and add an opt-in fast development build path.

Enhancements:

• Introduce opt-in accelerated debug build and test targets wired through a dedicated Cargo config fragment for Cranelift and mold.

Build:

• Add nightly-only dev-build and dev-test Make targets that use a separate Cargo config fragment for fast local debug builds.
• Extend Dependabot configuration to include weekly updates for the rust-toolchain ecosystem with appropriate dependency labels.

Documentation:

• Document the fast development build workflow, prerequisites, and isolation from release and verification builds in AGENTS.md.

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[sourcery-ai]

Reviewer's Guide

Aligns Dependabot configuration with the canonical Rust estate baseline and introduces an opt-in dev-fast build fragment with corresponding Make targets and documentation.

Sequence diagram for opt-in dev-fast build and test targets

sequenceDiagram
  actor Developer
  participant Makefile
  participant Cargo
  participant Cranelift_backend as Cranelift
  participant mold_linker as mold

  Developer->>Makefile: make dev-build
  Makefile->>Cargo: cargo --config tools/dev-fast/config.toml build
  Cargo->>Cranelift: use profile.dev codegen-backend="cranelift"
  alt [target_os = "linux"]
    Cargo->>mold: rustflags -Clink-arg=-fuse-ld=mold
  else [non-linux]
    Cargo->>Cargo: use platform_default_linker
  end

  Developer->>Makefile: make dev-test
  Makefile->>Cargo: cargo --config tools/dev-fast/config.toml test
  Cargo->>Cranelift: use profile.dev codegen-backend="cranelift"
  alt [target_os = "linux"]
    Cargo->>mold: rustflags -Clink-arg=-fuse-ld=mold
  else [non-linux]
    Cargo->>Cargo: use platform_default_linker
  end

Loading

File-Level Changes

Change	Details	Files
Introduce opt-in accelerated debug build targets wired to a shared Cargo config fragment.	Define DEV_FAST_CONFIG variable defaulting to tools/dev-fast/config.toml. Add dev-build and dev-test phony targets using cargo --config to build and test with the dev-fast configuration. Annotate the new targets as debug-only, nightly-dependent Cranelift+mold builds and keep them isolated from other build flows.	Makefile
Document usage and constraints of the dev-fast build fragment for contributors.	Add a 'Fast development builds' section explaining make dev-build and make dev-test. Clarify nightly toolchain and mold-on-Linux requirements and that the fragment is passed explicitly via --config. Warn against copying the fragment into .cargo/config.toml to avoid affecting release, coverage, and verification builds.	AGENTS.md
Align Dependabot configuration with canonical Rust baseline, including rust-toolchain coverage.	Add a rust-toolchain package-ecosystem stanza scoped to the repository root. Apply canonical dependency labels, including dependencies and rust-toolchain, to the new stanza. Ensure scheduling is set to weekly to match baseline remediation guidance.	.github/dependabot.yml
Add canonical dev-fast Cargo configuration fragment for accelerated local debug builds.	Introduce an opt-in Cargo config TOML that enables the unstable codegen-backend feature. Configure the dev profile to use the Cranelift backend for faster compilation. Gate mold linker usage behind a Linux-only target cfg via rustflags to keep other platforms on their default linker. Document interaction with existing rustflags in .cargo/config.toml and why this fragment remains external and explicit.	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.