[051] Add upstream license matrix

[konard]

Summary

• Adds docs/license-matrix.md covering TDLib, Telegram Android/Desktop/iOS/Web references, Teleton Agent, TON SDKs, swap SDK candidates, and native TON helper candidates.
• Documents reference-only boundaries for GPL, LGPL, unclear, and mixed-license upstreams, including source publication obligations and release legal-review gates.
• Adds automated coverage in test/license-compliance.test.mjs and npm run validate:foundation, then links the matrix from README, CONTRIBUTING, and BUILD-GUIDE.

Verification

• Reproducing check: node --test test/license-compliance.test.mjs failed before the matrix with missing docs/license-matrix.md; it passes now.
• npm test
• npm run validate:secrets
• npm run validate:foundation
• npm run validate:release
• npm run decompose:dry-run

Review Notes

This is an engineering license inventory, not legal advice. Human legal review is still required before release readiness for TDLib packaging, Telegram reference reuse, Teleton Agent bundling, TON SDK selection, and app-store distribution constraints.

Fixes #24

[konard]

Solution summary

Implemented and pushed the fix.

PR: #122

What changed:

• Added docs/license-matrix.md covering TDLib, Telegram references, Teleton Agent, TON SDKs, copyleft boundaries, source publication obligations, and legal review gates.
• Added test/license-compliance.test.mjs plus foundation validation coverage.
• Linked the matrix from README, CONTRIBUTING, and BUILD-GUIDE.
• Removed the generated .gitkeep placeholder.

Verification passed:

• npm test — 197 passed
• npm run validate:secrets
• npm run validate:foundation
• npm run validate:release
• npm run decompose:dry-run
• GitHub CI and Release validation are both passing on commit 2734878.

PR 122 is marked ready for review and has merge state CLEAN.

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[konard]

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• Requested: gpt-5.5
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