Agent task: add NLBoot object schemas

[mdheller]

@codex @copilot Please inspect SourceOS spec and SociOS-Linux/nlboot. Open one PR adding compact schemas and examples for NLBoot-related boot plan, artifact cache record, proof records, and Apple Silicon adapter evidence. Keep this repo as canonical schema/spec only.

[mdheller]

@codex Please take this in the SourceOS spec environment. One PR: NLBoot object schemas, examples, validation. No implementation code.

[mdheller]

@copilot Please take this if available. Keep this to schemas, examples, validation, and maturity metadata.

[chatgpt-codex-connector]

Summary

• Added four new compact NLBoot schemas (spec-only, no implementation code): NLBootPlan, NLBootArtifactCacheRecord, NLBootProofRecord, and AppleSiliconAdapterEvidence.
• Added one conforming example JSON payload per new schema under examples/, covering boot planning, cache integrity, proof checks, and Apple Silicon adapter/boot-picker evidence.
• Updated schema catalog quick-reference entries to include the new NLBoot and Apple Silicon evidence objects.
• Updated examples documentation with a dedicated “NLBoot object examples” section and added all new files to the examples file index.
• Committed changes on the current branch and created a PR message using the make_pr tool, per instruction.

Testing

• ✅ python3 -m json.tool schemas/NLBootPlan.json >/dev/null && python3 -m json.tool schemas/NLBootArtifactCacheRecord.json >/dev/null && python3 -m json.tool schemas/NLBootProofRecord.json >/dev/null && python3 -m json.tool schemas/AppleSiliconAdapterEvidence.json >/dev/null && python3 -m json.tool examples/nlboot_plan.json >/dev/null && python3 -m json.tool examples/nlboot_artifact_cache_record.json >/dev/null && python3 -m json.tool examples/nlboot_proof_record.json >/dev/null && python3 -m json.tool examples/apple_silicon_adapter_evidence.json >/dev/null && echo OK
• ⚠️ python3 -m pip install --user jsonschema >/dev/null && python3 - <<'PY' ... PY (failed due to environment proxy restrictions preventing PyPI access, so runtime schema-validation dependency could not be installed).

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[mdheller]

@copilot Assignment is active. Please open one bounded PR for this issue with validation evidence. Keep this to schemas, examples, validation, and spec docs.