docs(capture): update stale configuration reference

[kpr (KPR111)]

Summary

Correct the stale content in data-pipeline/capture/config/README.md, flagged by the documentation freshness automation (#1420). The reference had drifted from the current Pydantic models and schema tooling.

• Fix the RecordingConfig import path — src.common.config_models does not exist; the module is models.config_models. Corrected in both the runtime example and the schema-generation description.
• Fix the schema regeneration command — generate_config_schema.py writes to a repository-root-relative path, so it must be run from the root. The previously documented PYTHONPATH=. python config/generate_config_schema.py wrote the schema to a nested path instead.
• Document output_dir, which is defined on RecordingConfig and set in recording_config.yaml but was absent from the reference, including its absolute / exists / is-a-directory / is-writable validation rules.
• Add a top-level field table clarifying that only topics and trigger are required, and that unknown keys are rejected via extra: "forbid".
• Remove the frequency_hz out of range validation row — no such message exists in the models. Range and enum violations surface Pydantic's standard constraint messages instead.
• Replace the broken ../docs/inference/lerobot-inference.md link, which resolves to no file in the repository.
• Repair the mojibake in the Schema Maintenance heading, drop an empty code fence, and link the CI schema drift check to validate-config-schema.yml.
• Refresh ms.date per the documentation freshness policy.

Scope

Documentation only. One file changed, no code, schema, or configuration changes.

Validation

• markdownlint-cli2 clean
• cspell clean
• All nine relative links in the file resolve; previously one did not

Closes #1420

🤖 Generated with Claude Code

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