feat(recipes): add common development environments

[NovusEdge]

What changed

Upgrade devtools to recipe schema 3 with compiler, editor, and Git outputs, and add python-dev for an isolated Python environment. Both common recipes cover Alpine, Ubuntu, Debian, Fedora, and Arch.

python-dev requires an explicit existing user. An empty venv_dir performs a temporary smoke check; an absolute path creates or reuses a user-owned environment. Reapplication preserves existing files and rejects incompatible paths with actionable errors. It does not install packages into system Python with pip.

Why

Provide two useful development defaults with observable outputs and health checks. The curated recipe policy now permits this bounded bundled expansion. Additional guest adapters are a separate follow-up.

Tests run

• just check and just test at 628a797
• Exact CI lint and ShellCheck path through Nix
• Remote check, lint, ShellCheck, macOS host-primitives, and Windows host-primitives jobs
• Independent Sol review and bounded hardening round
• Final live matrix: Qualify Linux guest lifecycles and common recipes #81

Independent test author and implementer, followed by Sol review and one bounded fix round. Final static review is clear. Behavior tests cover package selection, outputs, explicit user handling, literal paths, environment ownership, and preservation of existing environments including the pip-missing case. Cloud provisioning requires #86 before the matrix is rerun.

OS matrix

• Alpine: the earlier run exposed the cloud-init readiness defect fixed by fix(sshx): wait for cloud-init readiness before provisioning #86; clean combined rerun tracked in Qualify Linux guest lifecycles and common recipes #81.
• Ubuntu 24.04: prior candidate passed compilation, Python/pip, output, health, and run-once preservation; final combined rerun tracked in Qualify Linux guest lifecycles and common recipes #81.
• Debian 13: prior candidate passed the same checks; final combined rerun tracked in Qualify Linux guest lifecycles and common recipes #81.
• Fedora 44: final combined run tracked in Qualify Linux guest lifecycles and common recipes #81.
• Arch: final combined run tracked in Qualify Linux guest lifecycles and common recipes #81.

The live gate checks the binary hash, guest cloud-init, applied markers, live health, returned executable paths, a C compilation fixture, Python/pip, and a sentinel surviving run-once reapplication. Prior-candidate results do not qualify the final candidate.

Docs

• Recipe overview and bundled recipe contribution policy updated.

Draft pending #86 and live qualification in #81. No merge is requested before final maintainer review.

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