feat: add BDD and YAGNI semantic anchors (resolves merge conflicts from LLM-Coding#138, LLM-Coding#139)

Content from @Nantero1's original PRs LLM-Coding#138 and LLM-Coding#139, rebased on current main
after merging LLM-Coding#137, LLM-Coding#140, LLM-Coding#142, LLM-Coding#143.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: raifdmueller

docs/all-anchors.adoc

@@ -33,6 +33,8 @@ include::anchors/spot-principle.adoc[leveloffset=+2]
 
 include::anchors/ssot-principle.adoc[leveloffset=+2]
 
+include::anchors/yagni.adoc[leveloffset=+2]
+
 <<<
 
 == Development Workflow
@@ -155,6 +157,8 @@ include::anchors/wardley-mapping.adoc[leveloffset=+2]
 
 == Testing & Quality Practices
 
+include::anchors/bdd-given-when-then.adoc[leveloffset=+2]
+
 include::anchors/iec-61508-sil-levels.adoc[leveloffset=+2]
 
 include::anchors/mutation-testing.adoc[leveloffset=+2]

docs/anchors/bdd-given-when-then.adoc

@@ -0,0 +1,48 @@
+= BDD (Behavior-Driven Development)
+:categories: testing-quality
+:roles: software-developer, qa-engineer, business-analyst, product-owner
+:proponents: Dan North
+:related: tdd-london-school, tdd-chicago-school, user-story-mapping
+:tags: bdd, gherkin, cucumber, specification-by-example, three-amigos, given-when-then, living-documentation
+
+[%collapsible]
+====
+Also known as:: Specification by Example, Executable Specifications
+
+[discrete]
+== *Core Concepts*:
+
+Given-When-Then:: Structured scenario format — Given a precondition, When an action occurs, Then an expected outcome results
+
+Specification by Example:: Concrete examples as executable specifications that define system behavior
+
+Three Amigos:: Collaborative discovery sessions between developer, tester, and business representative
+
+Gherkin syntax:: Domain-specific language for writing human-readable, machine-executable scenarios
+
+Living documentation:: Tests that serve as always-current system documentation
+
+Outside-in specification:: Start from desired business behavior, work inward to implementation
+
+Ubiquitous language:: Shared vocabulary bridging technical and business stakeholders in scenarios
+
+Discovery workshops:: Structured conversations to uncover requirements through examples before implementation
+
+
+Key Proponent:: Dan North ("Introducing BDD", 2006), creator of JBehave which influenced Cucumber's design (Cucumber created by Aslak Hellesøy, 2008)
+
+[discrete]
+== *When to Use*:
+
+* Cross-functional teams needing shared understanding of requirements
+* Systems where business rules are complex and need clear documentation
+* Projects requiring executable acceptance criteria
+* Bridging communication gaps between technical and non-technical stakeholders
+
+[discrete]
+== *Related Anchors*:
+
+* <<tdd-london-school,TDD, London School>> - Outside-in development approach that complements BDD
+* <<tdd-chicago-school,TDD, Chicago School>> - Developer-focused TDD practice
+* <<user-story-mapping,User Story Mapping>> - Requirements discovery that feeds BDD scenarios
+====

docs/anchors/yagni.adoc

@@ -0,0 +1,46 @@
+= YAGNI (You Aren't Gonna Need It)
+:categories: design-principles
+:roles: software-developer, software-architect, consultant
+:proponents: Ron Jeffries, Kent Beck
+:related: dry-principle, spot-principle, tdd-chicago-school
+:tags: yagni, extreme-programming, simplicity, incremental-design, over-engineering
+
+[%collapsible]
+====
+Full Name:: You Aren't Gonna Need It
+
+[discrete]
+== *Core Concepts*:
+
+Don't build for hypothetical futures:: Only implement functionality when it is actually needed, not when you foresee it might be needed
+
+Speculative generality:: Anti-pattern of building abstractions for imagined future requirements that may never materialize
+
+Incremental design:: Let design emerge through actual needs; evolve architecture as requirements become concrete
+
+Cost of carry:: Unused code adds maintenance burden, increases complexity, and creates cognitive load for the entire team
+
+Delete dead code:: Aggressively remove code that no longer serves a current purpose
+
+Extreme Programming origin:: Core XP practice alongside TDD, refactoring, and continuous integration
+
+Reversibility:: Prefer simple, changeable decisions over premature commitments to complex solutions
+
+
+Key Proponents:: Ron Jeffries (coined the phrase), Kent Beck ("Extreme Programming Explained", 1999)
+
+[discrete]
+== *When to Use*:
+
+* Fighting over-engineering and premature abstraction
+* Agile projects with iterative delivery and evolving requirements
+* Refactoring legacy systems burdened with unused features
+* When tempted to add "just in case" functionality or configurability
+
+[discrete]
+== *Related Anchors*:
+
+* <<dry-principle,DRY>> - Eliminates duplication of existing knowledge (complementary but distinct)
+* <<spot-principle,SPOT>> - Single Point of Truth, related simplicity principle
+* <<tdd-chicago-school,TDD, Chicago School>> - YAGNI is a core principle of classicist TDD
+====

skill/semantic-anchor-translator/references/catalog.md

@@ -14,6 +14,11 @@ Source: https://github.com/LLM-Coding/Semantic-Anchors
 - **Proponents:** Kent Beck, Martin Fowler
 - **Core:** State-based testing, real objects over mocks, refactoring-focused
 
+### BDD (Behavior-Driven Development)
+- **Also known as:** Specification by Example, Executable Specifications
+- **Proponents:** Dan North
+- **Core:** Given-When-Then scenarios, Gherkin syntax, three amigos, living documentation, outside-in specification
+
 ### Test Double (Meszaros)
 - **Proponents:** Gerard Meszaros
 - **Core:** Taxonomy of test substitutes — Dummy (unused), Stub (canned responses), Spy (records calls), Mock (verifies interactions), Fake (simplified implementation)
@@ -86,6 +91,10 @@ Source: https://github.com/LLM-Coding/Semantic-Anchors
 ### SSOT (Single Source of Truth)
 - **Core:** One system is the master for specific data
 
+### YAGNI (You Aren't Gonna Need It)
+- **Proponents:** Ron Jeffries, Kent Beck
+- **Core:** Don't build for hypothetical futures, speculative generality anti-pattern, incremental design, delete dead code
+
 ### GoF Design Patterns
 - **Also known as:** Design Patterns, Gang of Four Patterns
 - **Proponents:** Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides