chore(release): Prepare v2.0.0

[soulevilx]

What changed

Prepares the 2.0.0 major release: Guzzle 8-only transport, native MongoDB event logging, client DX APIs, fake transport tooling, and synchronized documentation and CI.

Breaking changes

Guzzle 8 and mongodb/mongodb ^2.0 are required; Laravel MongoDB integration and ClientRequestLog are removed. See UPGRADE-2.0.md.

Validation

• composer ci
• composer audit --no-dev --locked --abandoned=fail
• 98.39% line coverage

Release flow

After review and required checks pass, merge into master, tag v2.0.0 from master, then merge master back into develop.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/2.0.0

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.72%. Comparing base (bb4e6e7) to head (96edfb1).

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #32      +/-   ##
============================================
+ Coverage     98.32%   98.72%   +0.40%     
- Complexity      729      940     +211     
============================================
  Files            61       71      +10     
  Lines          1732     2198     +466     
============================================
+ Hits           1703     2170     +467     
+ Misses           29       28       -1     

Flag	Coverage Δ
unittests	98.72% <100.00%> (+0.40%)	⬆️

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