⚡ Bolt: pre-compile regexes in tools_memory.go

[lleontor705]

💡 What: Refactored multiple inline regexp.MustCompile calls in internal/mcp/tools_memory.go (specifically in functions normalizeTopicSegment, extractLearnings, and cleanMarkdown) to be package-level global variables. Added an entry to the .jules/bolt.md journal to document this optimization.

🎯 Why: regexp.MustCompile allocates memory and parses the regular expression state machine every single time it is called. When used inside functions that are called frequently or in loops, this introduces unnecessary per-call overhead and heap allocations. Pre-compiling them at the package level completely eliminates this runtime cost.

📊 Impact: Reduces CPU overhead and heap memory allocations during memory tool operations (specifically topic key normalization and learning extraction) by reusing thread-safe, pre-compiled state machines.

🔬 Measurement: Verified correctness via unit tests (go test ./...) which continue to pass identically. Performance improvement could be measured via go test -bench on the relevant normalizeTopicSegment and extractLearnings functions before and after the change, showing fewer allocs/op and reduced ns/op.

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PR created automatically by Jules for task 3976586067971291876 started by @lleontor705

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