feat(ops): QIR scaffold + --ops flag (doc-only behavior)

[flyingrobots]

This PR lands the smallest possible scaffold to de-risk the QIR feature proposed in RFC #19, without changing generation behavior:

• core: minimal QIR node types + a unit test for deterministic construction
• cli: --ops <dir> flag recognized in generate as a no-op validator (logs only)
• host-node config: ops section and validation (folder/target/guardrails/RLS reliance)
• docs: quick-start mentions experimental --ops and links the RFC draft

Notes

• No runtime compilation or SQL emission is introduced here.
• All changes are additive and behind a flag; existing workflows remain unaffected.
• Next steps (separate PRs): QIR printer + single example op lowering (behind the flag).

Targets base branch: feat/rfc-query-ops-qir.

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[flyingrobots]

Docs-only behavior: this adds QIR node scaffolding, a no-op --ops flag, and config knobs. No generation changes or workflow edits. Targeting the feature branch to keep the surface area minimal.

[github-actions]

🚢 SHIPME

[REALM] PASS — sha e3d4027