add custom manifests and CRDs via .deployah/

[atkrad]

Summary

• Add .deployah/manifests/ and .deployah/crds/ so users can ship raw Kubernetes YAML next to the generated Helm chart (Bitnami-style escape hatch).
• Manifests join the Helm release via a post-renderer; CRDs apply first with --crds create|create-replace, including when the Helm plan is idle.
• Wire plan/deploy/init, document in README/CLI help, and add integration scenarios for manifests, env-scoped extras + CRDs, and plan with extras.

Related

Fixes #4

Test plan

• Unit tests added/updated
• Scenario under scenarios/ (if behavior changes)
• nix run .#lint / pre-commit clean
• Manual smoke (command + expected result), if user-facing

Checklist

• Title is short and imperative (matches commit style)
• Docs / CLI help updated when user-facing (README.md, docs/cli/)
• No secrets or local-only paths in the diff

[codecov]

Codecov Report

❌ Patch coverage is 84.28184% with 116 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/cmd/deploy/deploy.go	64.21%	34 Missing ⚠️
internal/extras/crd.go	77.77%	24 Missing ⚠️
internal/extras/load.go	91.25%	16 Missing ⚠️
internal/extras/scope.go	88.50%	10 Missing ⚠️
internal/testing/types.go	77.77%	8 Missing ⚠️
internal/cmd/initialize/summary.go	83.87%	5 Missing ⚠️
internal/helm/helm.go	37.50%	5 Missing ⚠️
internal/helm/render.go	44.44%	5 Missing ⚠️
internal/cmd/plan/plan.go	85.71%	3 Missing ⚠️
internal/extras/object.go	93.75%	2 Missing ⚠️
... and 3 more

📢 Thoughts on this report? Let us know!