fix(cli,core): harden config resolution, format validation, exit code…

[devjayy43]

…s, and diagnostics

Closes #510
Closes #517
Closes #518
Closes #519

• (tooling/sanctifier-cli: Add integration/e2e coverage in CI (config file resolution precedence) #517) Add integration tests for config file resolution precedence (nearest .sanctify.toml wins; walks up to parent; defaults when absent)
• (tooling/sanctifier-cli: Harden input validation + error messages (output formats (text/json/sarif) parity) #518) Validate --format value early; reject unknown values with a clear error message; add sarif format dispatch to sanctifier analyze
• (tooling/sanctifier-cli: Refactor for clearer module boundaries (exit codes + CI integration) #519) Extract named exit-code constants to exit_codes.rs; wire AnalysisProfile (strict/lenient/audit/ci) into the exit-code decision in exec(); use EXIT_CODES::ERROR in main()
• (tooling/sanctifier-core: Release/publishing reliability improvements (diagnostics & error messages) #510) Add FindingCode::format_diagnostic() and lookup_finding_code() to sanctifier-core for structured, actionable diagnostic output; add unit tests for both helpers

Summary

Describe the change, the motivation behind it, and any important implementation details.

Fixes #

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Maintenance or refactor

Testing

List the commands you ran and the scope of validation.

cargo fmt --all --check
cargo clippy --workspace --all-targets --all-features -- -D warnings
cargo test -p sanctifier-core --all-features
cargo test -p sanctifier-cli
cd frontend && npm test

Checklist

• I ran the relevant tests locally, or explained why they were not needed.
• I updated documentation for any user-facing behavior changes.
• I added or updated tests for the change when appropriate.
• I added a changelog or release-notes entry when needed, or confirmed none is required.
• I verified this branch is up to date with main and merge conflicts are resolved.

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