Add GitHub report style guidance

[Andrew Gazelka (andrewgazelka)]

Summary

• Add DRY report composition guidance to the HTML deliverable section.
• Require faithful GitHub/Primer semantic colors with Primer Octicons for PRs, checks, failures, attention, links, commits, metadata, and cleanup.

Validation

• nix eval --raw --impure --expr '''import ./packages/agent/system-prompt.nix { lib = (import <nixpkgs> {}).lib; }'''
• Reread the rendered htmlDeliverable wording.

Refs #1528

(sent by an AI agent via Claude Code)

Note

Add DRY report guidance and Octicon color conventions to agent system prompt

Updates the system prompt in system-prompt.nix with two new guidance areas:

• Instructs the agent to keep reports DRY by avoiding repeated statements across sections.
• Expands Octicon usage rules to specify GitHub/Primer color associations (purple for merged PRs, green for passing checks, red for closed/failures, yellow for attention, blue for links/open navigation, gray for commits/metadata) and requires icons to be paired with a matching color and label.

^{Macroscope summarized 8e31c66.}

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