docs: replace hard-coded test counts with reproducible commands

[Olasunkanmi975]

##Closes #177

Overview

This PR cleans up stale, hard-coded test count claims in contributor-facing documentation (README.md and docs/SCF_PLAN.md).

As the test suites have expanded, static claims (such as "14 contract tests", "13 tlock tests", and "7 SDK tests") quickly became outdated, understating project coverage and introducing maintenance friction whenever new test cases were added.

Changes Included

• README.md:
  • Replaced hard-coded test counts with durable phrasing pointing directly to reproducible test execution commands (e.g., cargo test, pnpm test).
• docs/SCF_PLAN.md:
  • Replaced live test metrics with dynamic command references.
  • Ensured historical milestone logs/evidence remain explicitly labeled as frozen historical context where exact numbers were intentional.

Scope & Plan

• Update test count references in README.md
• Update test count references in docs/SCF_PLAN.md
• Verify execution commands run cleanly and produce exact live results

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[Olasunkanmi975]

@karagozemin This PR is ready for review! 🚀

Summary of Changes:

• README.md: Removed static test count claims (contract, tlock, and SDK tests) in favor of dynamic references pointing to execution commands (cargo test, pnpm test, etc.).
• docs/SCF_PLAN.md: Replaced live metric claims with reproducible commands while preserving explicitly labeled historical milestone data.

All referenced commands have been verified locally.