docs: close spec-librarian API drift findings across 5 package READMEs

[Copilot]

The Package Specification Librarian run failed after identifying API drift: 14 exported symbols were present in source but missing from package specs across typeutil, stringutil, constants, console, and linters. This PR updates those package READMEs so the documented public surface matches current exports.

• Type conversion spec completeness (pkg/typeutil)

  • Added an explicit exported-function inventory covering all public helpers, including previously missing lookup/path utilities and safe uint conversions.

• String utility API completeness (pkg/stringutil)

  • Documented missing public items: NormalizeLeadingWhitespace, FormatList, SanitizeOptions, and SanitizeName.
  • Added a small exported-types section to make SanitizeOptions discoverable.

• Version-gating constants coverage (pkg/constants)

  • Added missing minimum-version constants for firewall feature gating:
    • AWFDockerHostPathPrefixMinVersion
    • AWFTokenSteeringMinVersion

• Console public surface alignment (pkg/console)

  • Added missing exports to the API table:
    • BannerStyle
    • SpinnerWrapper

• Linter namespace coverage (pkg/linters)

  • Added osexitinlibrary as a documented subpackage and included osexitinlibrary.Analyzer in usage/API descriptions.

// Newly documented linter analyzer usage
import "github.com/github/gh-aw/pkg/linters/osexitinlibrary"

_ = osexitinlibrary.Analyzer

[Copilot]

Pull request overview

Updates package README specifications to eliminate documented/public API drift across several pkg/* packages so the documented surfaces match the current exported Go symbols.

Changes:

• Added missing exported symbol inventories and sections to typeutil and stringutil READMEs.
• Documented newly missing exported constants in constants and exports in console.
• Added osexitinlibrary subpackage to linters README with usage guidance.

Show a summary per file

File	Description
pkg/typeutil/README.md	Adds an exported-functions inventory covering all current public helpers.
pkg/stringutil/README.md	Documents missing exports (NormalizeLeadingWhitespace, FormatList, SanitizeOptions, SanitizeName) and adds an exported-types section.
pkg/linters/README.md	Documents the osexitinlibrary analyzer subpackage and includes it in the API/usage sections.
pkg/constants/README.md	Adds missing minimum-version constants for AWF feature gating to the documented list.
pkg/console/README.md	Adds missing exported items (BannerStyle, SpinnerWrapper) to the public API table.

Copilot's findings

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• Files reviewed: 5/5 changed files
• Comments generated: 0