Align Market Intelligence repository baseline

[eamirian]

Outcome

Aligns Market Intelligence with the public sibling-repository baseline shared with World Intelligence.

• adds the shared NOTICE, security policy, contribution guide, and Code of Conduct
• aligns README structure and Core / Intelligence / Domain ownership language
• makes the exact Market 0.6/Core 0.4 versus World 0.9/Core 0.5 release-cadence boundary explicit
• updates the roadmap so Core 0.5 compatibility is proven in a new Market release, not asserted by widening old metadata
• aligns connector licensing metadata and adds repository-baseline conformance assertions

Verification

• complete Market suite: 134 passed, 1 intentional skip
• Ruff and format checks passed
• lock check passed
• wheel and sdist built; strict Twine validation passed
• local Markdown links passed