feat: Phase 4 — 9 new features (v1.1)

REQ-MOB-010: BarcodeScreen.tsx — barcode scanner via react-native-camera
REQ-VIZ-001: WeeklyCalorieChart.tsx — 7-day bar chart on History screen
REQ-VIZ-002: Streak tracker — GET /meals/streak + HomeScreen badge
REQ-UX-001: Quick-add calories — POST /meals/quick-add + QuickAddScreen
REQ-UX-002: Food favourites — UserFoodMemory.favourite + toggle endpoint + FoodRow star
REQ-UX-003: GoalBanner.tsx — in-app slide-in when daily target hit
REQ-EXP-001: ExportController — GET /export/meals CSV download
REQ-WTR-001: Water tracking — WaterEntry entity + POST/GET /water + DailyDetails widget
REQ-UX-004: Daily logging reminder — HomeScreen after-18:00 banner

Also: Flyway V2 (favourite), V3 (water_entries), V4 (source constraints)
Traceability, CHANGELOG, PLAN updated after each feature

.virsaitis/backups/2026-05-18T21-35-44-534Z/copilot-modules/skills-standards.md

@@ -0,0 +1,207 @@
+Skills use SKILL.md format with YAML frontmatter. One skill per folder. Test before deploy.
+
+# Skills Standards - Native Agent Skills
+
+**Module**: Skills Standards
+**Component**: Native VS Code Agent Skills (Layer 4)
+**Load**: When creating/editing skills in .github/skills/
+**Version**: 3.0.0
+**Updated**: 2026-04-20
+
+---
+
+## Machine Policy
+
+```
+[SKILL_FORMAT]
+FORMAT=SKILL.md
+STRUCTURE=YAML_frontmatter + Markdown_body
+LOCATION=.github/skills/skill-name/SKILL.md
+TOKEN_TARGET=<5000_per_skill
+DESCRIPTION_LENGTH=~100_tokens
+VS_CODE_VERSION=1.109+
+```
+
+---
+
+## SKILL.md Format
+
+### File Structure
+
+```markdown
+---
+name: lowercase-hyphens-only
+description: what + when + keywords (1-1024 chars)
+license: MIT
+compatibility: VS Code 1.109+, Node.js 18+
+metadata:
+  tier: TIER-0 | TIER-1 | TIER-2 | TIER-3
+  category: governance | security | quality | language | testing
+  framework-version: "3.0.0"
+  author: virsaitis
+  version: "1.0.0"
+---
+
+# Skill Title
+
+## Overview
+## When to Activate
+## Standards & Rules
+## Consequences
+## Procedures
+## Examples
+## Validation & Testing
+## Quick Reference
+```
+
+### Frontmatter Requirements (TIER-1)
+
+| Field | Required | Format | Example |
+|-------|----------|--------|---------|
+| `name` | Yes | lowercase-hyphens, 1-64 chars | `python-development` |
+| `description` | Yes | plain text, 1-1024 chars | What + When + Keywords |
+| `license` | No | SPDX identifier | `MIT` |
+| `compatibility` | No | version requirements | `VS Code 1.109+` |
+| `metadata.tier` | Yes (Virsaitis) | TIER-0 through TIER-3 | `TIER-1` |
+| `metadata.category` | Yes (Virsaitis) | governance/security/quality/language/testing | `governance` |
+
+**Name MUST match directory name exactly.**
+
+**Description MUST include**: what the skill does, when to activate, discovery keywords.
+
+---
+
+## Required Sections
+
+### Overview
+What this skill does and why. Use atomic sentences. 2-3 paragraphs.
+
+### When to Activate
+Keywords and scenarios for VS Code skill activation. Include keyword list for discovery.
+
+### Standards & Rules
+Specific rules grouped by TIER level. Each rule: Name, TIER, Enforcement, Rationale.
+
+### Consequences (Virsaitis Extension)
+Impact chains per TIER violation. Five dimensions: Operation, User, Technical, Business, Remediation.
+
+```markdown
+### TIER-0 Violations
+**Rule**: [Rule Name]
+**If Violated**:
+- **Operation**: BLOCKED immediately
+- **User Impact**: [effect on user]
+- **Technical Impact**: [what breaks]
+- **Business Impact**: [why it matters]
+- **Remediation**: [how to fix]
+```
+
+### Procedures
+Step-by-step workflows with commands and expected outcomes.
+
+### Examples
+Good vs Bad code snippets with compliance explanations.
+
+### Validation & Testing
+Commands to verify compliance, expected output, error interpretation.
+
+### Quick Reference
+Summary table for rapid lookup.
+
+---
+
+## Directory Structure
+
+```
+.github/skills/
+├── skill-name/
+│   ├── SKILL.md          (required - main skill file)
+│   ├── scripts/          (optional - helper scripts)
+│   ├── references/       (optional - reference docs)
+│   └── assets/           (optional - images, examples)
+```
+
+---
+
+## Validation (TIER-1)
+
+```bash
+# Validate skill structure
+skills-ref validate .github/skills/skill-name/
+
+# Expected output:
+# ✓ Skill name matches directory
+# ✓ Description within 1-1024 chars
+# ✓ Frontmatter valid YAML
+# ✓ SKILL.md found
+```
+
+Fix all errors before committing.
+
+---
+
+## Token Efficiency (TIER-2)
+
+**Targets**:
+- Description: ~100 tokens (efficient discovery)
+- Full skill body: <5000 tokens (~500 lines)
+- Total loaded: <1% of 200K context window
+
+**VS Code loads skills in 3 levels**:
+1. **Metadata** (~100 tokens): Always loaded for discovery
+2. **Instructions** (<5000 tokens): Loaded when skill activated
+3. **Resources** (on-demand): Loaded only when referenced
+
+Keep SKILL.md lean. Put large examples in `references/`.
+
+---
+
+## Skill Development Workflow
+
+### Create New Skill
+
+1. Choose skill name (lowercase-hyphens)
+2. Create directory: `.github/skills/skill-name/`
+3. Fill frontmatter (name must match directory)
+4. Write sections: Overview → Rules → Consequences → Procedures
+5. Add good/bad examples
+6. Validate: `skills-ref validate`
+7. Test activation in VS Code 1.109+
+8. Update CHANGELOG and commit
+
+### Modify Existing Skill
+
+1. Read current SKILL.md fully
+2. Maintain atomic sentence structure
+3. Update version in frontmatter
+4. Validate and test before commit
+
+---
+
+## Quick Reference
+
+| Aspect | Standard | Tool |
+|--------|----------|------|
+| **Format** | SKILL.md | VS Code markdown |
+| **Location** | .github/skills/ | Repository root |
+| **Frontmatter** | YAML | `---` delimiters |
+| **Tokens** | <5000 body | Word count estimate |
+| **Validation** | skills-ref | `skills-ref validate` |
+| **VS Code** | 1.109+ | Check release |
+
+---
+
+*Skills Standards Module v3.0.0*
+*Native VS Code Agent Skills for Virsaitis governance*
+
+---
+
+## Key Rules From This Module
+
+- SKILL.md is the entry point. YAML frontmatter with description is required.
+- One skill per folder. Folder name matches skill purpose.
+- Test every skill before deployment. Manual validation required.
+- Skills in `.github/skills/` are the one exception to .github write restrictions.
+- Definitions: `.github/virsaitis-definition-library.md`
+
+Return to hub: `.github/copilot-instructions.md`