Implements comprehensive transaction validation for mock-chain package.

[AdityaGupta20871]

Features Added

• Minimum nanoergs per box validation (based on box size)
• Miner fee validation (fee-per-byte threshold)
• Custom fee ErgoTree support
• Configurable validation options
• Can disable all checks or specific checks

Methods

• validateTransaction() - Main validation function
• checkMinNanoergsPerBox() - Box value validation
• checkMinerFee() - Fee validation
• isFeeContract() - Fee contract detection
• TransactionCheckOptions - Configuration type

Breaking Changes

None - validation is enabled by default but non-breaking:

• Only errors (insufficient box values) cause failures
• Warnings (missing fees) are logged but don't fail
• Use checks: false to disable validation

Testing

• 14 new unit tests in transactionChecks.spec.ts
• 4 integration tests in mockChain.spec.ts
• All 67 tests passing

Closes #120

[changeset-bot]

⚠️ No Changeset found

Latest commit: e99ee31

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[AdityaGupta20871]

@arobsn LMK if any changes are needed! :)

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.94%. Comparing base (69c8309) to head (e99ee31).

Files with missing lines	Patch %	Lines
packages/mock-chain/src/mockChain.ts	77.77%	4 Missing ⚠️
packages/mock-chain/src/transactionChecks.ts	96.07%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #205      +/-   ##
===========================================
- Coverage   100.00%   99.94%   -0.06%     
===========================================
  Files          124      125       +1     
  Lines        14204    14324     +120     
  Branches      1778     1808      +30     
===========================================
+ Hits         14204    14316     +112     
- Misses           0        8       +8     

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[pkg-pr-new]

@fleet-sdk/blockchain-providers

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commit: e99ee31

[arobsn]

@AdityaGupta20871 thanks for your PR. Please check why multiple CI tasks are failing.

[AdityaGupta20871]

@arobsn Fixed! The CI failures were due to:
Lint/format issues in my files which should be resolved (removed unused import, fixed template literals, fixed formatting)
Can you review it again! It also build successfully