feat: add buildmanual target, faker demo, subprocess examples, and contributing sidebar to manual

Add Makefile buildmanual target for manual generation and include faker_demo.wren, subprocess_async_demo.wren, subprocess_concurrent_demo.wren, and subprocess_fiber_demo.wren example scripts. Update manual sidebar across api pages to link new web-server tutorial and contributing section with module architecture, pure-wren/c-backed modules, foreign classes, async patterns, testing, and documentation pages.

test/faker/basic.wren

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+// retoor <retoor@molodetz.nl>
+
+import "faker" for Faker
+
+var name = Faker.name()
+System.print(name.contains(" ")) // expect: true
+
+var email = Faker.email()
+System.print(email.contains("@")) // expect: true
+
+var firstName = Faker.firstName()
+System.print(firstName.count > 0) // expect: true
+
+var lastName = Faker.lastName()
+System.print(lastName.count > 0) // expect: true
+
+var city = Faker.city()
+System.print(city.count > 0) // expect: true
+
+var address = Faker.address()
+System.print(address.contains(",")) // expect: true
+
+var ipv4 = Faker.ipv4()
+System.print(ipv4.contains(".")) // expect: true
+
+var uuid = Faker.uuid()
+System.print(uuid.count == 36) // expect: true
+
+var phone = Faker.phoneNumber()
+System.print(phone.contains("(")) // expect: true
+
+var company = Faker.company()
+System.print(company.count > 0) // expect: true
+
+var job = Faker.jobTitle()
+System.print(job.count > 0) // expect: true
+
+var word = Faker.word()
+System.print(word.count > 0) // expect: true
+
+var sentence = Faker.sentence()
+System.print(sentence.endsWith(".")) // expect: true
+
+var hexColor = Faker.hexColor()
+System.print(hexColor.startsWith("#")) // expect: true
+System.print(hexColor.count == 7) // expect: true
+
+var price = Faker.price()
+System.print(price >= 1) // expect: true
+System.print(price <= 1000) // expect: true
+
+var bool1 = Faker.boolean()
+System.print(bool1 is Bool) // expect: true
+
+var digits = Faker.numerify("###-##-####")
+System.print(digits.count == 11) // expect: true
+System.print(digits[3] == "-") // expect: true
+
+var letters = Faker.letterify("???-???")
+System.print(letters.count == 7) // expect: true
+System.print(letters[3] == "-") // expect: true
+
+System.print("All basic tests passed") // expect: All basic tests passed

test/faker/seeding.wren

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+// retoor <retoor@molodetz.nl>
+
+import "faker" for Faker
+
+Faker.seed(12345)
+var name1 = Faker.name()
+var email1 = Faker.email()
+var city1 = Faker.city()
+var int1 = Faker.randomInt(1, 100)
+
+Faker.seed(12345)
+var name2 = Faker.name()
+var email2 = Faker.email()
+var city2 = Faker.city()
+var int2 = Faker.randomInt(1, 100)
+
+System.print(name1 == name2) // expect: true
+System.print(email1 == email2) // expect: true
+System.print(city1 == city2) // expect: true
+System.print(int1 == int2) // expect: true
+
+Faker.seed(99999)
+var name3 = Faker.name()
+System.print(name1 != name3) // expect: true
+
+Faker.reset()
+
+System.print("Seeding tests passed") // expect: Seeding tests passed