chore: release af-v0.6.1.5

[github-actions]

Release af-v0.6.1.5

0.6.1.5 (2026-04-18)

• feat(af): clean up stale .claude/commands on init, switch spec-picker to AskUserQuestion
• docs: annotate FORK.md baseline with upstream version
• feat: manifest-driven plugin dispatch + remove git commit hooks
• docs: update FORK.md with refactor changes
• fix: update test expectations for AF extension refactor
• feat: template hook processing and branch validation changes
• feat: refactor init flow — force flag, hook ordering, copilot cleanup
• feat: implement AF extension lifecycle hooks

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Merging this PR will trigger a tagged release with extension ZIPs.