docs+cli: deprecate prompt targets and remove generate_prompt_targets command (#944)

Prompt targets are no longer actively maintained. Mark them as deprecated in
the docs and remove the `planoai generate_prompt_targets` CLI command that
existed only to scaffold them.

Docs
- Add `.. deprecated::` banner to the Prompt Target concept page and to the
  function-calling guide / quickstart sections that walk users through
  configuring prompt targets.
- Relabel the Prompt Target card on the overview page as deprecated.
- Drop the Prompt Targets bullet from the README's Getting Started list.

CLI
- Remove the `generate_prompt_targets` Click command, its registration, and
  the `Utilities` rich-click command group.
- Delete `cli/planoai/targets.py` (the command's only consumer).
- Drop the `planoai prompt_targets` section from the CLI reference page.

Skills
- Delete the `cli-generate` rule, drop it from `plano-cli-operations`
  (description, when-to-use, rules list, execution checklist), and update
  the skills README. Hand-edit AGENTS.md to remove section 6.2 and renumber
  6.3/6.4 so the commit stays scoped (regenerating pulled in unrelated
  drift between rules/ and AGENTS.md).

The runtime gateway, schema, and existing demo configs still accept
`prompt_targets` blocks; this is deprecation, not removal of behavior.
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Musa 2026-06-03 13:38:51 -07:00 committed by GitHub
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@ -183,7 +183,6 @@ Ready to try Plano? Check out our comprehensive documentation:
- **[LLM Routing](https://docs.planoai.dev/guides/llm_router.html)** - Route by model name, alias, or intelligent preferences
- **[Agent Orchestration](https://docs.planoai.dev/guides/orchestration.html)** - Build multi-agent workflows
- **[Filter Chains](https://docs.planoai.dev/concepts/filter_chain.html)** - Add guardrails, moderation, and memory hooks
- **[Prompt Targets](https://docs.planoai.dev/concepts/prompt_target.html)** - Turn prompts into deterministic API calls
- **[Observability](https://docs.planoai.dev/guides/observability/observability.html)** - Traces, metrics, and logs
## Contribution