Percentage sign fix

[tsuz]

fixes #23

[Copilot]

Pull request overview

Fixes issue #23 where a % character in the system prompt caused String.format to throw at runtime. Replaces format-string templating with direct StringBuilder concatenation, and adds a test asserting % is preserved literally.

Changes:

• Replace SYSTEM_PROMPT_TEMPLATE (format string with %s) with a plain SYSTEM_PROMPT_BASE string.
• Refactor buildSystemPrompt to concatenate via StringBuilder and add a package-private overload that accepts the base prompt for testability.
• Add a regression test covering literal % handling in both base prompt and memoir context.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
think/think-consumer/src/main/java/io/flightdeck/think/consumer/ThinkConsumer.java	Removes String.format-based prompt template; builds system prompt via StringBuilder and exposes a test overload.
think/think-consumer/src/test/java/io/flightdeck/think/consumer/SystemPromptTest.java	Adds regression test ensuring % in prompt and memoir context is preserved literally.

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