[spec-extractor] Update package specifications for agentdrain, cli, console, constants

[github-actions]

Summary

Documentation-only update to two package READMEs, adding specifications for recently introduced symbols in pkg/console and pkg/constants.

Changes

pkg/console/README.md

• Added four new stderr-TTY-aware format functions to the exports table and reference table:
  • FormatSuccessMessageStderr — success message checking os.Stderr TTY state
  • FormatInfoMessageStderr — info message checking os.Stderr TTY state
  • FormatListItemStderr — list entry checking os.Stderr TTY state
  • FormatSectionHeaderStderr — section header checking os.Stderr TTY state
• Added a Stderr TTY Variants subsection explaining that *Stderr variants check os.Stderr (not os.Stdout) for terminal detection; callers writing directly to os.Stderr should use these to ensure correct color stripping in piped/non-interactive contexts.
• Added a Go usage example for all four new variants.

pkg/constants/README.md

• Added a File Permission Constants section documenting five new fs.FileMode values for consistent file and directory creation:
  • FilePermSensitive (0o600) — owner-only read/write (config files, credentials)
  • FilePermPublic (0o644) — owner read/write + world read (normal files)
  • FilePermExecutable (0o755) — owner/group/world executable (scripts, binaries)
  • DirPermSensitive (0o750) — owner+group access (sensitive directories)
  • DirPermPublic (0o755) — standard non-sensitive directory access

Scope

Documentation only — no Go source files modified. No behaviour changes.

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