docs: expand CONTRIBUTING guide and add PR template #1

	name: PR title lint

	on:
	pull_request:
	types:
	- opened
	- edited
	- synchronize
	- reopened

	jobs:
	lint-pr-title:
	name: Validate conventional commit title
	runs-on: ubuntu-latest
	steps:
	- name: Check PR title format
	env:
	PR_TITLE: ${{ github.event.pull_request.title }}
	run: \|
	# Pattern: <type>(<optional scope>): <description>
	# Allowed types: feat fix docs chore refactor style
	PATTERN='^(feat\|fix\|docs\|chore\|refactor\|style)($[a-z0-9/,. -]+$)?: .{1,100}$'

	if echo "$PR_TITLE" \| grep -qE "$PATTERN"; then
	echo "PR title is valid: $PR_TITLE"
	else
	echo "::error::PR title does not follow Conventional Commits format."
	echo ""
	echo " Got: $PR_TITLE"
	echo ""
	echo " Expected format: <type>(<scope>): <description>"
	echo " Allowed types: feat \| fix \| docs \| chore \| refactor \| style"
	echo ""
	echo " Examples:"
	echo " feat(guides): add stellar multisig withdrawal guide"
	echo " fix(sdk): correct Chain enum example"
	echo " docs: expand CONTRIBUTING with branch model"
	echo " chore(ci): pin actions/checkout to v4"
	echo ""
	echo " See CONTRIBUTING.md for the full commit message guide."
	exit 1
	fi

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