docs(experiments): trim model experiment plan

[markijbema]

Summary

• Trim duplicated model-experiment plan sections now covered by .specs/model-experiments.md.
• Keep the plan focused on implementation status, current architecture notes, and concrete follow-ups.
• Update status/deferred notes to reflect the spec registration and existing admin prompt download path.

Verification

• Reviewed the plan diff for duplicated durable-rule sections.

Visual Changes

N/A

Reviewer Notes

• Chained on top of docs(experiments): add model experiments spec #3463 (mark-model-experiments-spec).

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Final commit further simplifies the Schema section of .plans/experimental-models-1.md, stripping verbose implementation details and retaining only table names and a pointer to the upstream schema file — no functional or logic changes introduced.

Files Reviewed (1 file)

• .plans/experimental-models-1.md

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_{Reviewed by claude-sonnet-4.6 · 107,238 tokens}

_{Review guidance: REVIEW.md from base branch main}