UX: the self-healing CLI — AI-driven fix offers on command failure

[db-tycoon-stephen]

Migrated from the archived repo: Database-Tycoon/localhost-stack#18 (opened 2026-04-04). Original text below; status notes at the end.

The CLI should transition from being a passive executor to an active, intelligent agent. When commands like tycoon data transform run fail, the CLI should proactively offer AI-driven fixes (e.g., "I detected a dbt error. Would you like me to attempt an auto-fix?"). This leverages our existing AI capabilities to fulfill the 'zero-config' mission.

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Status notes at migration (2026-08-09)

• Started work exists on the local branch feature/self-healing-cli (global exception handler + fixer registry foundations), written against the pre-rewrite codebase — treat as design reference, not a mergeable base.
• Depends on the local-LLM backend question (see the migrated "lighter LLM backend" issue) and should be retriaged against the post-rewrite command architecture ([Project] Ingestion rewrite — Runtime, Destination, MetadataBackend #81).

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Mirrored in Jira: PTC-116 (Epic: PTC-5, AI / agent refinements). Dev work continues here.