fix: read issue comments for full context

The issue body may be sparse with important context in comments.
Explicitly instruct the agent to use `gh issue view --comments`.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Ambient Code Bot

.github/workflows/amber-issue-handler.yml

@@ -82,7 +82,7 @@ jobs:
 
             ## Instructions
 
-            1. Read the issue and understand the problem.
+            1. Read the issue body and all comments for full context (`gh issue view --comments`).
             2. Explore the codebase to find the relevant code.
             3. Create a plan for how to fix the issue. If there is any ambiguity —
                unclear requirements, multiple valid approaches, missing context — you
@@ -275,7 +275,7 @@ jobs:
 
             ## Instructions
 
-            1. Read the issue and understand the problem.
+            1. Read the issue body and all comments for full context (`gh issue view --comments`).
             2. Explore the codebase to find the relevant code.
             3. Create a plan for how to fix the issue. If there is any ambiguity —
                unclear requirements, multiple valid approaches, missing context — you