fix: correct documentation inaccuracies for license.validator, platform.*, and observability.otel modules

[Copilot]

Several module type docs introduced in #66 contained inaccuracies or omissions relative to actual schema definitions and factory implementations.

Documentation fixes

• license.validator — Removed false claim that license_key supports $ENV_VAR expansion; describes the actual fallback: reads WORKFLOW_LICENSE_KEY env var when config value is empty
• platform.provider — Added missing config (map) and tiers (JSON) fields from schema/module_schema.go
• platform.resource — Added missing name, tier, capabilities, and constraints fields; corrected description to match schema ("capability-based resource declaration")
• platform.context — Removed nonexistent path field; fixed tier type from number → string select (infrastructure | shared_primitive | application); marked org and environment as required

Code fix

• observability.otel factory (plugins/observability/modules.go) — Factory was ignoring the config map entirely. Now reads endpoint and serviceName and applies them via SetEndpoint()/SetServiceName(), making the documented config fields actually functional:

// Before
func otelTracingFactory(name string, _ map[string]any) modular.Module {
    return module.NewOTelTracing(name)
}

// After
func otelTracingFactory(name string, cfg map[string]any) modular.Module {
    m := module.NewOTelTracing(name)
    if v, ok := cfg["endpoint"].(string); ok && v != "" {
        m.SetEndpoint(v)
    }
    if v, ok := cfg["serviceName"].(string); ok && v != "" {
        m.SetServiceName(v)
    }
    return m
}

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