Merge pull request #187 from secmon-lab/fix/bluebell-selector-context-block

simplify(bluebell): remove conditional branching from selector.md template

refactor(bluebell): remove resolveIntentDefault, unify into resolveIntentWithSelection

fix(bluebell): run intent resolver with 0 prompt entries and post context block

Merge pull request #186 from secmon-lab/refactor/extract-chat-orchestrator

fix: remove redundant aster.New call in default chat UseCase init

refactor(chat): extract common logic into chat.UseCase, strategies implement chat.Strategy

test(chat): add characterization tests for common behavior across strategies

Merge pull request #185 from secmon-lab/feat/bluebell-chat-strategy

docs(bluebell): add link to default system.md as template example

fix(bluebell): correct nosec rule ID from G601 to G118

fix(bluebell): suppress gosec false positive on context.WithCancel

refactor(bluebell): rename to strategy-system-prompts, add name/UserSystemPrompt

fix: address review comments — move docs to doc/, pre-allocate slice

fix(bluebell): use strings.Split instead of SplitN(-1) to fix lint