Document Ontology-SpecGraph-SpecSpace roadmap

[SoundBlaster]

Summary

• Add a Platform coordination roadmap for the Ontology-SpecGraph-SpecSpace line.
• Link the roadmap from AGENTS.md so future cross-repo work can find the active sequencing.
• Record the next recommended slice as SpecGraph 0108 semantic review surface contract + artifact builder + tests.

Validation

• git diff --check
• Local .0al ops note written: inbox/platform/20260613T113416Z-note-ontology-specgraph-specspace-roadmap-captured.md

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