docs: add consolidated ProofPath master context v0.3

[safal207]

What changed

Adds docs/MASTER_CONTEXT.md, a consolidated canonical context for ProofPath assembled from the available project discussions and prior materials.

The document brings together:

• product positioning and the Assured Action model;
• ACCEPT / REJECT / HOLD semantics;
• Guard, Quorum, Bonded, and Covered tiers;
• witness incentives, independence, commitment–reveal, and disputes;
• the production-deploy pilot, metrics, API, repository blueprint, threat model, and roadmap;
• the relationship between ProofPath, CML, LTP, LiminalDB, Ibex, PoCI, TRACE, and the Agent Action Safety Chain skill.

Why

ProofPath context was distributed across multiple discussions and artifacts. This creates one durable source of truth for future implementation, product decisions, partner conversations, and documentation work.

Validation

• Added as a new file; no existing repository files were modified.
• Verified the GitHub blob hash against the generated local artifact: a99d2308f98c14fd5a46e7378b2d7a6d0a66dc01.
• Documentation-only change; no runtime or CI behavior is affected.

Review note

The document is intentionally comprehensive and mostly Russian-language. Follow-up PRs can split stable sections into dedicated English RFCs and product documents while keeping this file as the historical master context.

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