feat: add factorial benchmark scenario

[Unisay]

Summary

• Add complete factorial benchmark scenario analogous to fibonacci
• Add scenarios/factorial.md specification for factorial(10) = 3628800 target
• Implement Factorial.hs module with recursive approach
• Create complete Plinth_1.52.0.0_Unisay factorial submission
• Replace redundant source file copies with README links to original source files
• Re-generate report

Key Results

• Target: factorial(10) = 3628800 ✅
• CPU Units: 5,859,917
• Memory Units: 21,751
• All validations pass: Schema compliance, functional correctness

Files Added/Modified

scenarios/factorial.md                           # Benchmark specification
plinth/src/Factorial.hs                        # Haskell implementation  
plinth/app/Main.hs                             # Unified executable
submissions/factorial/Plinth_1.52.0.0_Unisay/ # Complete submission
└── source/README.md → ../../../../plinth/src/Factorial.hs

Test Plan

• Built and tested: cabal run fibonacci generates both UPLC files
• Verified correct output: factorial(10) = 3628800
• Validated submission: All schema checks pass
• Source links: README files link to original implementation
• Code formatting: All files properly formatted

Related to https://github.com/IntersectMBO/plutus-private/issues/1758

[Copilot]

Pull Request Overview

This PR adds a factorial benchmark scenario to the UPLC-CAPE benchmarking framework, complementing the existing fibonacci benchmark. The implementation provides a recursive factorial function that computes factorial(10) = 3628800, following the same patterns and structure as the existing fibonacci benchmark.

Key Changes:

• Added factorial benchmark scenario specification and implementation
• Created Factorial.hs module with recursive factorial algorithm
• Generated complete submission with performance metrics and documentation

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
scenarios/factorial.md	Comprehensive specification document defining the factorial benchmark requirements, acceptance criteria, and submission guidelines
plinth/src/Factorial.hs	Core factorial implementation using PlutusTx with recursive algorithm targeting factorial(10)
plinth/uplc-cape-benchmarks.cabal	Updated library to expose the new Factorial module alongside existing Fibonacci module
plinth/app/Main.hs	Modified main application to generate factorial.uplc output file in addition to fibonacci.uplc
submissions/factorial/Plinth_1.52.0.0_Unisay/*	Complete benchmark submission including UPLC program, metadata, metrics, and documentation
submissions/fibonacci/*/source/README.md	Added source code documentation for existing fibonacci submissions