LLM responds to review comments to evolve forms

[danielnaab]

User Story:

As a form creator (Maya), in order to iterate on form designs through natural conversation during review, I want the LLM to read my review comments and propose changes to the form specs

Preconditions:

• A review (PR) exists for a form branch (Story 5)
• Maya can leave comments on the review page

Acceptance Criteria:

• Maya can leave a comment on a review that describes a desired change
• The LLM interprets the comment and proposes form shaping commands
• Maya can accept or reject the LLM's proposed changes
• Changes from accepted proposals appear as new commits on the branch
• The review diff updates to reflect the new changes
• Conversation thread is preserved for context

Notes:

• Builds on Story 5's review/comment infrastructure and Story 4's command-based shaping
• This is an agentic integration point: the LLM participates in the review process
• Comments are the input channel; shaping commands are the output
• Spun off from Story 5 design discussion (2026-04-16)

Definition of Done:

• Acceptance criteria met
• Tests pass
• Type checking passes
• Deployed and demoable