mb3r-stack v0.3.3 candidate integration bundle

mb3r-stack v0.3.3

Patch bundle release that refreshes the Bering pin after the Bering release metadata hygiene patch.

What changed

• upgrades the bundle Bering pin from v0.3.2 to v0.3.3
• keeps Sheaft pinned at v0.2.3
• keeps the stack-level adapter envelopes stable at v1alpha1
• keeps the formal stack maturity at candidate
• refreshes README badges, examples, docs, adapter digest checks, and compatibility metadata to the current patch line

Upstream pins in this bundle

• Bering v0.3.3 pinned to ghcr.io/mb3r-lab/bering@sha256:b38713a15194827f3410c3972071a5fd358f1fe55847952289f5edd7c0b82174
• Sheaft v0.2.3 pinned to ghcr.io/mb3r-lab/sheaft@sha256:07bca0e01ef0bfb09c9561c2883d7acf7b2ee6374be373ecd0168747da9f1e76

Release posture

• verified by repository validation, adapter e2e, release dry-run, and Helm template rendering on 2026-05-01
• the locally staged package set is mb3r-stack-0.3.3.tgz, mb3r-assets-0.3.3.tgz, release-manifest.json, SHA256SUMS.txt, and sbom.cdx.json
• Bering v0.3.3 keeps the 1.0.0 and 1.1.0 schema contract lines unchanged
• Sheaft v0.2.3 keeps the same accepted Bering contract lines and fixes serve / watch startup when the first Bering artifact appears after Sheaft starts
• Sheaft serve / watch remains preview-grade upstream behavior and is not promoted to a long-term stable contract by this bundle release