feat(codegen): generate embedder config reference for CLI docs

[pyramation]

Summary

Adds a one-time embedder.md skill reference to the CLI docs generator, produced alongside the existing context.md, auth.md, and config.md infrastructure references. The reference is only generated when any table in the schema has Vector fields (detected via categorizeSpecialFields with category === 'embedding').

Both codegen paths are updated:

• generateSkills (single-target CLIs)
• generateMultiTargetSkills (multi-target CLIs like csdk)

The generated reference includes two examples:

1. Ollama + nomic-embed-text on localhost (open-source, local)
2. OpenAI with an API key

Review & Testing Checklist for Human

• OpenAI provider not yet implemented in runtime: The examples reference openai as a supported provider and embedder.apiKey as a config key, but templates/embedder.ts only handles ollama in buildEmbedder() and EmbedderConfig has no apiKey field. Decide whether these examples should be aspirational or removed until runtime support lands.
• Verify generated output: Run codegen against a schema with Vector fields (e.g. agentic-db) and confirm embedder.md appears exactly once in the skill references directory, not duplicated per-table.
• tables[0] access in single-target path: When hasEmbeddings is true, tables[0] is used for the example command. This should always be safe (embedding implies ≥1 table), but worth a glance.

Notes

• The duplication between single-target and multi-target blocks follows the existing pattern used by context/auth/config references in the same file.
• After this merges, re-running codegen on agentic-db will produce the embedder configuration docs automatically.

Link to Devin session: https://app.devin.ai/sessions/dadc6f4634e844739846793b8c75ca86
Requested by: @pyramation

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