sBTC integration, Codecov setup, and documentation updates

[proofofgame]

Changes

• sBTC multi-currency support with separate fee tracking
• Owner-only session finalization for centralized moderation
• Separate minimum bet limits for STX and sBTC
• Codecov integration with GitHub Actions
• Complete README documentation update (public + private functions)
• Test suite: 86 tests (84 passing, 2 skipped due to simnet limitations)
• Vitest 3.2.4 for compatibility

New Functions

strike-core.clar:

• \set-min-token-limit-sbtc\ - Set minimum sBTC bet (default 10 sBTC)
• \withdraw-fees-sbtc\ - Withdraw accumulated sBTC fees
• \get-total-fees-sbtc\ - Read sBTC fee balance
• \get-min-token-limit-sbtc\ - Read minimum sBTC bet

Testing

\\�ash
npm test # 84 passed, 2 skipped
clarinet check # 0 errors, 20 warnings (non-critical)
\\

Notes

• 2 tests skipped: sBTC integration tests require testnet deployment (simnet limitation with external contract admin functions)
• All contract changes validated with 0 errors
• Ready for deployment

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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