feat: comprehensive registry improvements

Community docs:
- CODE_OF_CONDUCT.md (Contributor Covenant v2.1)
- SECURITY.md (vulnerability reporting policy)
- CHANGELOG.md (initial release notes)
- CODEOWNERS (per-type review ownership)

GitHub config:
- Issue templates: bug-report, pricing-correction, documentation
- FUNDING.yml (GitHub Sponsors)

Validation enhancements:
- Cross-reference check: hand [[requires]] → integration existence
- Routing alias collisions as warnings (errors with --strict)
- --strict flag to promote warnings to errors
- --type filter to validate single content type
- CI: add taplo format check and lychee link check jobs

Developer experience:
- Makefile with validate, fmt, and scaffold targets
- Scaffold templates for all 5 content types
- .pre-commit-config.yaml (trailing whitespace, TOML check, validate)
- docs/content-guide.md (naming, descriptions, prompts, decision guide)

Content quality:
- schema.toml: add last_verified field for model pricing
- CONTRIBUTING.md: add pricing verification guide with source links

Makefile

@@ -0,0 +1,105 @@
+# LibreFang Registry — Development Tooling
+# Usage: make help
+
+.DEFAULT_GOAL := help
+SHELL := /bin/bash
+
+TEMPLATES_DIR := templates
+AGENTS_DIR    := agents
+HANDS_DIR     := hands
+INTEGRATIONS_DIR := integrations
+SKILLS_DIR    := skills
+PROVIDERS_DIR := providers
+
+# ── Validation ────────────────────────────────────────────────────────────────
+
+.PHONY: validate
+validate: ## Run registry validation
+	python3 scripts/validate.py
+
+.PHONY: validate-strict
+validate-strict: ## Run validation treating warnings as errors
+	python3 scripts/validate.py --strict
+
+# ── Formatting ────────────────────────────────────────────────────────────────
+
+.PHONY: fmt
+fmt: ## Format all TOML files with taplo (skips if not installed)
+	@if command -v taplo >/dev/null 2>&1; then \
+		echo "Formatting TOML files..."; \
+		find . -name '*.toml' -not -path './.git/*' -exec taplo fmt {} +; \
+		echo "Done."; \
+	else \
+		echo "taplo not found — skipping TOML formatting."; \
+		echo "Install: cargo install taplo-cli  or  brew install taplo"; \
+	fi
+
+.PHONY: fmt-check
+fmt-check: ## Check TOML formatting without modifying
+	@if command -v taplo >/dev/null 2>&1; then \
+		taplo fmt --check $$(find . -name '*.toml' -not -path './.git/*'); \
+	else \
+		echo "taplo not found — skipping format check."; \
+		echo "Install: cargo install taplo-cli  or  brew install taplo"; \
+	fi
+
+# ── Scaffolding ───────────────────────────────────────────────────────────────
+
+.PHONY: new-agent
+new-agent: ## Scaffold a new agent (usage: make new-agent NAME=my-agent)
+	@if [ -z "$(NAME)" ]; then echo "ERROR: NAME is required. Usage: make new-agent NAME=my-agent"; exit 1; fi
+	@if [ -d "$(AGENTS_DIR)/$(NAME)" ]; then echo "ERROR: Agent '$(NAME)' already exists."; exit 1; fi
+	@mkdir -p "$(AGENTS_DIR)/$(NAME)"
+	@sed 's/{{NAME}}/$(NAME)/g' "$(TEMPLATES_DIR)/agent.toml" > "$(AGENTS_DIR)/$(NAME)/agent.toml"
+	@echo "Created $(AGENTS_DIR)/$(NAME)/agent.toml"
+	@echo "Next: edit the agent.toml to fill in TODO placeholders."
+
+.PHONY: new-hand
+new-hand: ## Scaffold a new hand (usage: make new-hand NAME=my-hand)
+	@if [ -z "$(NAME)" ]; then echo "ERROR: NAME is required. Usage: make new-hand NAME=my-hand"; exit 1; fi
+	@if [ -d "$(HANDS_DIR)/$(NAME)" ]; then echo "ERROR: Hand '$(NAME)' already exists."; exit 1; fi
+	@mkdir -p "$(HANDS_DIR)/$(NAME)"
+	@sed 's/{{NAME}}/$(NAME)/g' "$(TEMPLATES_DIR)/HAND.toml" > "$(HANDS_DIR)/$(NAME)/HAND.toml"
+	@echo "Created $(HANDS_DIR)/$(NAME)/HAND.toml"
+	@echo "Next: edit the HAND.toml to fill in TODO placeholders."
+
+.PHONY: new-integration
+new-integration: ## Scaffold a new integration (usage: make new-integration NAME=my-service)
+	@if [ -z "$(NAME)" ]; then echo "ERROR: NAME is required. Usage: make new-integration NAME=my-service"; exit 1; fi
+	@if [ -f "$(INTEGRATIONS_DIR)/$(NAME).toml" ]; then echo "ERROR: Integration '$(NAME)' already exists."; exit 1; fi
+	@sed 's/{{NAME}}/$(NAME)/g' "$(TEMPLATES_DIR)/integration.toml" > "$(INTEGRATIONS_DIR)/$(NAME).toml"
+	@echo "Created $(INTEGRATIONS_DIR)/$(NAME).toml"
+	@echo "Next: edit the file to fill in TODO placeholders."
+
+.PHONY: new-skill
+new-skill: ## Scaffold a new skill (usage: make new-skill NAME=my-skill)
+	@if [ -z "$(NAME)" ]; then echo "ERROR: NAME is required. Usage: make new-skill NAME=my-skill"; exit 1; fi
+	@if [ -d "$(SKILLS_DIR)/$(NAME)" ]; then echo "ERROR: Skill '$(NAME)' already exists."; exit 1; fi
+	@mkdir -p "$(SKILLS_DIR)/$(NAME)"
+	@sed 's/{{NAME}}/$(NAME)/g' "$(TEMPLATES_DIR)/skill.toml" > "$(SKILLS_DIR)/$(NAME)/skill.toml"
+	@echo "Created $(SKILLS_DIR)/$(NAME)/skill.toml"
+	@echo "Next: edit the skill.toml to fill in TODO placeholders."
+
+.PHONY: new-provider
+new-provider: ## Scaffold a new provider (usage: make new-provider NAME=my-provider)
+	@if [ -z "$(NAME)" ]; then echo "ERROR: NAME is required. Usage: make new-provider NAME=my-provider"; exit 1; fi
+	@if [ -f "$(PROVIDERS_DIR)/$(NAME).toml" ]; then echo "ERROR: Provider '$(NAME)' already exists."; exit 1; fi
+	@sed 's/{{NAME}}/$(NAME)/g' "$(TEMPLATES_DIR)/provider.toml" > "$(PROVIDERS_DIR)/$(NAME).toml"
+	@echo "Created $(PROVIDERS_DIR)/$(NAME).toml"
+	@echo "Next: edit the file to fill in TODO placeholders."
+
+# ── Help ──────────────────────────────────────────────────────────────────────
+
+.PHONY: help
+help: ## Show this help
+	@echo "LibreFang Registry — Available targets:"
+	@echo ""
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
+		awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[36m%-20s\033[0m %s\n", $$1, $$2}'
+	@echo ""
+	@echo "Scaffold examples:"
+	@echo "  make new-agent NAME=my-agent"
+	@echo "  make new-hand NAME=my-hand"
+	@echo "  make new-integration NAME=my-service"
+	@echo "  make new-skill NAME=my-skill"
+	@echo "  make new-provider NAME=my-provider"