refactor: replace webgl-layer-framework with webgl-layer module

- Removed the webgl-layer-framework module and its associated tests.
- Introduced a new webgl-layer module to handle WebGL2 layer management.
- Updated references throughout the codebase to use the new webgl-layer module.
- Adjusted layer registration and rendering logic to align with the new structure.
- Ensured compatibility with existing functionality while improving modularity.

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -1,61 +0,0 @@
-# generated: 2026-03-12
-# project: Fantasy-Map-Generator
-# project_key: NOKEY
-# tracking_system: file-system
-# story_location: _bmad-output/implementation-artifacts
-
-# STATUS DEFINITIONS:
-# ==================
-# Epic Status:
-#   - backlog: Epic not yet started
-#   - in-progress: Epic actively being worked on
-#   - done: All stories in epic completed
-#
-# Epic Status Transitions:
-#   - backlog → in-progress: Automatically when first story is created (via create-story)
-#   - in-progress → done: Manually when all stories reach 'done' status
-#
-# Story Status:
-#   - backlog: Story only exists in epic file
-#   - ready-for-dev: Story file created in stories folder
-#   - in-progress: Developer actively working on implementation
-#   - review: Ready for code review (via Dev's code-review workflow)
-#   - done: Story completed
-#
-# Retrospective Status:
-#   - optional: Can be completed but not required
-#   - done: Retrospective has been completed
-#
-# WORKFLOW NOTES:
-# ===============
-# - Epic transitions to 'in-progress' automatically when first story is created
-# - Stories can be worked in parallel if team capacity allows
-# - SM typically creates next story after previous one is 'done' to incorporate learnings
-# - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
-
-generated: 2026-03-12
-project: Fantasy-Map-Generator
-project_key: NOKEY
-tracking_system: file-system
-story_location: _bmad-output/implementation-artifacts
-
-development_status:
-  # Epic 1: WebGL Layer Framework Module
-  epic-1: done
-  1-1-pure-functions-types-and-tdd-scaffold: done
-  1-2-framework-core-init-canvas-and-dom-setup: done
-  1-3-layer-lifecycle-register-visibility-render-loop: done
-  epic-1-retrospective: done
-
-  # Epic 2: Relief Icons Layer Migration
-  epic-2: done
-  2-1-verify-and-implement-per-icon-rotation-in-buildsetmesh: done
-  2-2-refactor-draw-relief-icons-ts-to-use-framework: done
-  2-3-webgl2-fallback-integration-verification: done
-  epic-2-retrospective: done
-
-  # Epic 3: Quality & Bundle Integrity
-  epic-3: done
-  3-1-performance-benchmarking: done
-  3-2-bundle-size-audit: done
-  epic-3-retrospective: done