chore: prepare official MCP Registry listing (1.2.11)

[DMontgomery40]

Prepare the multi-printer server for listing in the official MCP Registry. Add the matching npm ownership field and registry metadata, including backend configuration and secret credential inputs, in patch release 1.2.11.

Validation: official registry schema validation; npm test (455 passed, 2 optional installed-preset skips); npm run test:package (all three entrypoints, version, and Blender discovery); documentation site build; local standards/spec review. Runtime and printer behavior are unchanged.

Publication must complete through the main-branch trusted-publishing workflow before submitting this version to the registry. The existing workflow currently fails npm authorization; its package publishing settings need verification.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-29T22:45:27.767558Z	d6f04d6	PR opened

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[DMontgomery40]

Integrated with original history through #31. Package ownership metadata and server.json are synchronized at 1.2.11, validated against the official Registry schema, and included in the packed artifact.

1.2.11 is now published to npm through the main-branch trusted publishing workflow, with matching commit, tag and fresh installed startup verified. MCP Registry submission remains pending; the metadata is ready, but no Registry listing is claimed.