v2.3.0 - SOFR hedging, durable lifecycle and portable Windows binaries

v2.3.0: SOFR hedging, durable lifecycle and portable Windows binaries

This release connects computed sensitivities to a constrained hedge decision,
adds complete contractual payment checks and durable lifecycle journals, and
removes compiler-DLL PATH requirements from default Windows executables.

• A 5Y SOFR hedge study sizes 2Y/4Y/6Y positions under USD 1.5 million per-instrument
  limits and USD 1,000 lot rounding. Quote-DV01 norm falls 51.68%; assumed entry
  costs are USD 379.73. Ten full-repricing shocks show residual and nonlinear risk,
  including cases that worsen. QuantLib independently checks 44 instrument PVs
  and 28 quote sensitivities. JSON, CSV and PNG/SVG results are committed.
• C++ exposes the full lag-adjusted SOFR payment schedule. The basis workflow
  derives final obligations from realized coupons and reconciles the complete
  inventory and amounts before normal-maturity closure.
• An optional Python/SQLite journal wrapper serializes concurrent writers,
  atomically validates/appends batches across streams, rejects conflicting
  retries and replays persisted state. Strict contract inventories prevent
  missing-payment closure. Tests include four processes, 80 concurrent events
  and process death before commit.
• Firm OIS import policy adds execution-size, expiry and source/usage-reference
  checks. Actual executable quotes still require authorized external data;
  synthetic examples remain clearly labeled.
• Windows builds embed compiler runtimes by default. A PowerShell launcher
  builds/tests/runs the example, and CPack produces a CLI/library ZIP with example
  inputs, build information and runtime license notices.
• README encoding is repaired, committed terminal auto-approval is removed,
  and implementation walkthroughs explain calibration, accrual and collateral.

Run

From a configured source checkout:

.\run.ps1 -WithPython -Test

Or download and extract rates-engine-2.3.0-Windows-AMD64.zip, open PowerShell in
its extracted root and run:

.\bin\rates_cli.exe --quotes examples/synthetic_quotes.csv --swap examples/sample_swap.csv --out results/demo

The ZIP contains the native CLI tools and static library. Python workflows are
built from source for the chosen interpreter. The Windows ZIP targets x64 with
the Universal CRT; its C++ library uses the LLVM-MinGW ABI.

Verification

Local Windows x64, LLVM-MinGW Clang 23.1.3, Python 3.14.0, QuantLib 1.44:

Check	Result
Release, bindings enabled	100/100 CTest tests passed
Debug, bindings enabled	100/100 CTest tests passed
Full Release suite with system-only PATH	100/100 passed
Independent hedge prices and quote risks	72 comparisons passed
Durable lifecycle and contract checks	20 passed
Hedge solver fixtures / market-data unit tests	4 / 7 passed
Installed C++ consumer with system-only PATH	Passed
Extracted ZIP, relocated CLI tools and actual pricing	Passed
C++ formatting and clang-tidy build	Passed

See runtime evidence,
hedge results, and
durable lifecycle results.
The cross-platform workflow runs the new tests and requires independent
QuantLib hedge validation. The release commit's
22 October CI run
passed all seven jobs: Linux GCC Release, Linux Clang Debug, Windows MSVC Release,
macOS Release, sanitizers, static analysis and LLVM coverage.

This remains a deterministic swaps project. Options, stochastic models, XVA,
licensed executable feeds and a production clearing service are not claimed.