release: prepare base-bash-libs 2.2.2

[codeforester]

Summary

• advance the package and embedded release metadata to 2.2.2
• publish the documentation fixes from docs: link the reference consumer as a learning path from the docs index and quickstart #568 and docs: align the README lead and repository description with the v2 CLI/application framework #569 in the 2.2.2 changelog
• align the README, pinned-consumption guide, versioning policy, quickstart, consumer ledger, and SPDX workflow with v2.2.2

Validation

• candidate artifact build and verification against 22e2c99
• ./tests/validate.sh
• git diff --check
• repository-owned release plan and notes preflights

Fixes #573