Add package dependencies and project settings page

Package Dependencies:
- Add artifact dependency management system
- Add dependency API endpoints (get, resolve, reverse)
- Add ensure file parsing for declaring dependencies
- Add circular dependency and conflict detection
- Add frontend dependency visualization with graph modal
- Add migration for artifact_dependencies table

Project Settings Page (#65):
- Add dedicated settings page for project admins
- General settings section (description, visibility)
- Access management section (moved from project page)
- Danger zone with inline delete confirmation
- Add Settings button to project page header

CHANGELOG.md

@@ -6,8 +6,44 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Added Project Settings page accessible to project admins (#65)
+  - General settings section for editing description and visibility
+  - Access Management section (moved from project page)
+  - Danger Zone section with inline delete confirmation requiring project name
+  - Settings button (gear icon) on project page header for admins
+- Added artifact dependency management system (#76, #77, #78, #79, #80, #81)
+  - `artifact_dependencies` table with version/tag constraints and check constraints
+  - `ArtifactDependency` SQLAlchemy model with indexes for fast lookups
+  - Ensure file parsing (`orchard.ensure` YAML format) during artifact upload
+  - Circular dependency detection at upload time (rejected with 400)
+  - Dependency conflict detection at resolution time (409 with conflict details)
+- Added dependency API endpoints (#78, #79):
+  - `GET /api/v1/artifact/{artifact_id}/dependencies` - Get dependencies by artifact ID
+  - `GET /api/v1/project/{project}/{package}/+/{ref}/dependencies` - Get dependencies by ref
+  - `GET /api/v1/project/{project}/{package}/reverse-dependencies` - Get reverse dependencies (paginated)
+  - `GET /api/v1/project/{project}/{package}/+/{ref}/resolve` - Resolve full dependency tree
+- Added dependency resolution with topological sorting (#79)
+  - Returns flat list of all artifacts needed in dependency order
+  - Includes download URLs, sizes, and version info for each artifact
+- Added frontend dependency visualization (#84, #85, #86):
+  - Dependencies section on package page showing direct dependencies for selected tag
+  - Tag/version selector to switch between artifacts
+  - "Used By" section showing reverse dependencies with pagination
+  - Interactive dependency graph modal with:
+    - Tree visualization with collapsible nodes
+    - Zoom (mouse wheel + buttons) and pan (click-drag)
+    - Click to navigate to package
+    - Hover tooltip with package details
+    - Error display for circular dependencies and conflicts
+- Added migration `008_artifact_dependencies.sql` for dependency schema
+- Added `dependencies.py` module with parsing, validation, and resolution logic
+- Added comprehensive integration tests for all dependency features
+
 ### Changed
 - Added pre-test stage reset to ensure known environment state before integration tests (#54)
+- Upload endpoint now accepts optional `ensure` file parameter for declaring dependencies
+- Updated upload API documentation with ensure file format and examples
 
 ## [0.5.1] - 2026-01-23
 ### Changed