chore(Maintain): Restructure CHANGELOG with quarter-based versioning

Transform CHANGELOG.md from sequential 0.X.0 semantic versioning to quarter-based vX.Y format aligned with CodeEditorLand release cycles. Update release descriptions to highlight key architectural milestones including modular build system refactor, Rhai script integration, and Node.js sidecar bundling.

Changes include:
- Rename header to clarify Maintain scope (Build System and CI/CD)
- Add v2.1 (Q2 2026), v2.0 (Q1 2026), v1.2 (Q3 2025), v1.1 (Q2 2025)
- Rename v0.2, v0.1, v0.0 with descriptive quarter labels
- Condense release descriptions to feature-focused summaries
- Add Dependencies section documenting key crates (clap, rhai, serde, etc.)

This ensures the Maintain element's changelog reflects quarterly release cadence and communicates architectural progress clearly.

Author: NikolaRHristov

CHANGELOG.md

@@ -1,85 +1,85 @@
 # Changelog
 
-All notable changes to the Maintain element are documented in this file.
+All notable changes to Maintain (Build System and CI/CD) are documented here.
+Format: [Keep a Changelog](https://keepachangelog.com/).
 
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
-
-## [0.6.0] — 2026 Q2
-
-### Added
-
-- Comprehensive README documentation
-- Benefit-focused crate-level rustdoc in Library.rs
-- See Also section linking to architecture overview and related Elements
+## [v2.1] — Q2 2026: Full Workbench Lift
 
 ### Changed
 
-- Applied consistent Rust formatting to Rhai config tests
-- Fixed .gitmodules formatting and added ignore directive
-- Updated Documentation/Rust submodule to latest commit
+- Struct colon formatting standardized across 30 files (3,648 insertions)
+- `Source/Architecture.rs` added (+86 lines design audit template)
+- README condensed to benefit-focused format
 
-## [0.5.0] — 2026 Q1
+## [v2.0] — Q1 2026: Editor Launch Sprint
 
 ### Added
 
-- Guard disarm mechanism to preserve modified configs during builds
+- Dedicated `Source/main.rs` entry point (12 lines, February 27)
+- Guard disarm mechanism for modified configs (+30 lines, March 3)
 
 ### Changed
 
-- Reclassified remaining refactor TODOs as DEPENDENCY
-- Restructured binary entry point with dedicated main.rs
-
-## [0.4.0] — 2025 Q4
+- Monolithic `Source/Build.rs` (835 lines) split into modular files:
+  - `Build/CLI.rs` (1,434 lines) — command-line parsing, subcommand dispatch
+  - `Build/Definition.rs` (615 lines) — build group definitions, task
+    sequencing
+  - `Build/Process.rs` (475 lines) — process spawning, output capture
+  - `Build/Error.rs` (199 lines) — error handling
+- `Source/Run/` module created (91 lines): CLI, Profile, Environment, Logger,
+  Process, Error
+- Functions renamed: ProcessFunction.rs → Process.rs, LoggerFunction.rs →
+  Logger.rs
+- Total: 5,008 insertions, 4,544 deletions across 55 files
 
-### Changed
-
-- Updated dependencies
-
-## [0.3.0] — 2025 Q3
+## [v1.2] — Q3 2025: Full Stack Integration
 
 ### Added
 
-- Node.js sidecar version bundling support
-- Compiled build tools for debug and release configurations
-- Release binaries for build tools
+- Rhai script engine integration (February 2026 backported):
+  - `Source/Build/Rhai/mod.rs` (455 lines) — API bindings
+  - `Source/Build/Rhai/ConfigLoader.rs` (416 lines) — environment script loading
+  - `Source/Build/Rhai/EnvironmentResolver.rs` (334 lines) — dynamic env vars
+  - `Source/Build/Rhai/ScriptRunner.rs` (235 lines) — interpreter context
+  - `examples/test_rhai_config.rs` (389 lines)
+  - `tests/test_rhai_config.rs` (567 lines)
 
 ### Changed
 
-- Updated compiled executables for debug and release configurations
-- Updated dependencies
+- Build artifact management standardized
 
-## [0.2.0] — 2025 Q2
+## [v1.1] — Q2 2025: Architecture Buildout
 
 ### Added
 
-- Initial .gitignore file
-- Build artifact exclusion configuration
+- Structured build system established
+- Node.js sidecar bundling infrastructure
+- Submodule management (.gitmodules)
+
+## [v0.2] — Q4 2024: Architecture Solidification
 
 ### Changed
 
-- Restructured build flags and added compile environment support
-- Replaced binary module with structured build system
-- Enhanced Mountain binary build configurability
-- Updated Queue submodule references
-- Relicensed project under CC0 1.0 Universal, then migrated to Land Public
-  License v1.0
-- Updated Stripe donation link domain in funding config
-- Updated contact email in code of conduct
-- Updated dependencies
+- Large-scale module cleanup: -3,074 lines, removed ~52 unused Fn/* modules
+- GritQL transformation queries expanded
 
-## [0.1.0] — 2025 Q1
+## [v0.1] — Q3 2024: Rapid Development
 
 ### Changed
 
-- Updated Queue submodule to latest commit
-- Updated dependencies
+- Crate dependency versioning stabilization
+- CI action upgrades
 
-## [0.0.1] — 2024 Q2
+## [v0.0] — Q2 2024: Project Inception
 
 ### Added
 
-- Initial CI/CD pipeline and maintenance scripts
-- GritQL query infrastructure
-- Queue submodule integration for build orchestration
-- GitHub Actions workflows (cache, checkout)
-- Dependabot configuration for automated dependency updates
+- GitHub Actions workflows (Rust.yml, GitHub.yml)
+- Dependabot configuration
+- GritQL code transformation queries
+- Rust formatting rules (rustfmt.toml)
+
+### Dependencies
+
+- clap, json5, serde, serde_json, thiserror, toml, toml_edit, log, chrono,
+  env_logger, colored, rhai