After narrowing the colon marker to lines starting with a generic
determiner ("My plan:" / "The approach:" / ...), inline product or
pricing answers like "Your current Plan: Pro includes local chats",
"The plan: Basic is free, Pro is $10/month", or
"My plan: use dynamic programming" still slipped into the re-prompt
path and could wipe a valid answer.
Add a lookahead requiring a newline (with optional trailing horizontal
whitespace) after the colon, so only header-style framings like
"Plan:\n1. search\n2. summarise" or "My approach:\n1. fetch" count.
Inline "Plan: <text>" is now treated as ordinary prose.
Add eight regression samples (lesson plan, meal plan, marketing plan,
pricing plan, recommended approach, migration plan, dynamic-programming
plan, currently active plan) all of which previously re-prompted under
the unanchored matcher and now correctly do not.
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