fix: harden crypto input validation

[koistya]

Summary

• formatFence: Reject invalid inputs before BigInt() conversion
• makeStorageKey: Validate numeric config parameters
• Bump version to 2.5.3

Changes

formatFence hardening — fixes contract violations:

formatFence(-0.1)    // was: "000000000000000", now: throws LockError
formatFence(NaN)     // was: RangeError leaked, now: throws LockError
formatFence(42.9)    // was: "000000000000042", now: throws LockError

makeStorageKey validation — prevents limit bypass:

makeStorageKey("p", "k", -100, 0)  // now throws: "backendLimitBytes must be a positive integer"
makeStorageKey("p", "k", 1000, NaN) // now throws: "reserveBytes must be a non-negative integer"

New constant FENCE_FORMAT_MAX (10^15-1) distinguishes the format limit from FENCE_THRESHOLDS.MAX (9e14) operational limit.

Test coverage

All edge cases covered: NaN, Infinity, negative fractions, non-integers, invalid config.

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.63%. Comparing base (549ad5f) to head (47e4cb4).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
common/crypto.ts	93.93%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   76.37%   76.63%   +0.26%     
==========================================
  Files          42       42              
  Lines        2688     2718      +30     
==========================================
+ Hits         2053     2083      +30     
  Misses        635      635              

Flag	Coverage Δ
contracts-firestore	47.05% <50.00%> (-0.01%)	⬇️
contracts-postgres	42.96% <35.29%> (-0.06%)	⬇️
contracts-redis	40.21% <35.29%> (-0.01%)	⬇️
e2e	58.92% <50.00%> (-0.16%)	⬇️
unit	64.92% <100.00%> (+0.55%)	⬆️

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Files with missing lines	Coverage Δ
common/constants.ts	100.00% <100.00%> (ø)
common/crypto.ts	92.03% <93.93%> (+2.74%)	⬆️

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